In addition to having launched numerous attacks against the team, Ari made himself the prime target in the Season 2 episode, Twilight (episode) where in a surprise move, he fatally shot NCIS Special Agent Caitlin Todd in the head with a lone .308 round from a Bravo 51 sniper rifle that he was manning. The impact of the gunshot killed Kate instantly while leaving her NCIS colleagues devastated over her murder and Gibbs hellbent on avenging Kate's death at any cost and by any means necessary.
Ari's wave of terror which had started when he invaded the NCIS morgue, triggering a hostage situation and had continued on for nearly two years finally came to a permanent end when he was ultimately killed in a confrontation with Gibbs and Ari's fellow Mossad Officer/half-sister Ziva David in September 2005.
Ari was born in 1969 to Dr. Benjamin Weinstein (the undercover alias of Mossad agent and future Mossad director Eli David), and Dr. Hasmia Haswari, an Arab woman while they were both doctors working together at a hospital in Jerusalem.
Ari gained two half-sisters: Ziva and Tali David with all three presumably harboring a strong sense of loyalty towards each other. The three also possibly lived a happy life together.
Tragically, Talia died in a Hamas-orchestrated suicide bombing at the age of sixteen, her death devastating both Ari and Ziva.
In 1994, Ari graduated from Edinburgh Medical College (the same alma mater as NCIS Medical Examiner Dr. Donald Mallard).
After graduation, he did his post-graduate work at the Edinburgh Center for Infectious Diseases. He was described by his colleague there, Dr. Martin Sedgewick, as a brilliant ladies's man who answered only to his surname, "Haswari" and never "Ari".
Ari eventually left the center altogether and began working alongside his mother at a local clinic in the Gaza strip. During that same time, Ari began harboring strong feelings of resentment towards Eli as Ari believed that like Ziva, Eli had shaped him to be a Mossad mole inside Hamas.
Seeking revenge, Ari began secretly working against his father.
In early 2000, four years before his first meeting with the NCIS team, Ari's mother was killed during a retaliatory missile strike from Israel, her death presumably greatly devastating Ari and further enhancing his need for revenge against Eli. Ari also believed that Eli had personally orchestrated the strike on purpose: to give Ari a perfect reason for joining Hamas, while still working undercover for Mossad.
Unfortunately, this had the opposite effect as Ari turned against Eli, subsequently becoming a double agent for both Mossad and a series of unnamed terrorist groups, one of them being al-Qaeda with Ari bidding and waiting until he was in the perfect position to strike back at both his father and Israel.
NCIS Season 1Edit
Ari made his debut appearance in the Season 1 episode, Bête Noire (episode) where at the time of his first appearance, he was working undercover as a member of the local Hamas cell.
His superiors ordered him to locate the body another terrorist, Yasir Qassam who had botched a plan to spread smallpox on the Norfolk Naval Base, a plot NCIS had learnt of after receiving evidence from NCIS Special Agent Paula Cassidy who was stationed at Gitmo.
Ari successfully invaded NCIS by hiding in a body-bag which was then taken to the NCIS morgue.
Upon its arrival, Ari emerged and took NCIS Medical Examiner Dr. Donald Mallard and Ducky's assistant, Gerald Jackson hostage. He also shot out the video cameras, presumably to avoid any kind of detection from the main NCIS personnel.
Kate later wound up in the morgue and became the third and final hostage of the siege. In revenge for being lied to, Ari shot Gerald in the left shoulder with Ducky and Kate managing to stabilize Gerald and also stop any bleeding from the wound.
Having received news of the siege, the NCIS building was evacuated with Ari making one simple demand: the terrorist's body and belongings be returned to him in exchange for the hostages.
Gibbs later appeared in the morgue and the two faced off with Ari impressed at the distance Gibbs had shot Qassam from and offering Gibbs the chance to kill him.
Almost immediately, Gibbs accepted but in a surprise move, was shot in his own respective left shoulder before collapsing to the ground where he drifted in out and of consciousness. He learnt that the gunshot was a through and through and soon realized to his dismay that Ari had escaped which Ari had achieved by shooting two H.R.T. agents with one dying. Taking the man's uniform, Ari escaped NCIS, disguised as an H.R.T. agent where he met a Mossad team with Ziva and future former Mossad member Namir Eschel were there before the team headed to a safehouse.
Gibbs would recover from the gunshot but developed a strong, almost obsessive need to discover Ari's identity.
Following this encounter, Gibbs devoted the next two months to scouring different databases in search of who Ari was with his searches going nowhere and even proving fruitless at times and it all seemed hopeless until NCIS Special Agent Timothy McGee who was stationed at Norfolk at the time of Ari's first appearance came up the idea to put new photos onto Gibbs's hard-drive in hopes of getting some answers.
McGee's search eventually uncovered Ari's true identity along with key information regarding Ari's past.
Three months later, in May 2004, Ari returned in the Season 1 finale episode, "Reveille" where it was shown that he had become the leader of his own Hamas cell, the group planning to kidnap then U.S. President George W. Bush and also Israeli Prime Minister Ariel Sharon.
Ari also had his men abduct Kate and bring her to his countryside home where he sought to know the planes escorting the two men. When Kate first refused, Marta, a Swedish woman who had befriended DiNozzo at the beginning of the episode appeared and revealed that she would kill DiNozzo during their date while also confirming that she too was working for Ari.
Kate ultimately surrendered, presumably to stop Marta from killing Tony but despite Marta's efforts which included holding Kate's own SIG against her, Kate refused to give in and berated Marta for her involvement.
Upon learning that Marta was going to tell the members of the cell the developments, Ari shot Marta in the head and then told Kate that he was actually an Israeli working for the Mossad. He then offered to inform the Secret Service about the plans of his cell with the plans being thwarted thanks to the FBI.
After learning that Ari was in fact working undercover in both Hamas and Al-Qaeda with the FBI providing support and also giving him a leeway, Gibbs confronted Ari in the NCIS morgue and subsequently shot him in the left shoulder not only in revenge for Ari having inflicted the same fate onto Gibbs and Gerald a few months ago but to better convince members of Al-Qaeda that Ari was truly working against the U.S. and Israel.
Ari would make a full recovery from the shoulder wound but his obsession with Gibbs and the need to best him in their "game" grew far stronger.
NCIS Season 2Edit
In the Season 2 finale episode, "Twilight", one of Ari's men, disguised as a Virginia State Police Officer killed two Navy officers by shooting them.
Knowing that Gibbs and his team would be called to investigate once the bodies were discovered, Ari and his new group took the necessary information they needed for a drone.
They also rigged the car with a bomb so that it would kill members of Gibbs's team.
Hours later, the team arrived with Ari watching them from a distance and although the bomb did go off, the team managed to avoid death thanks to DiNozzo's quick reflexes. Unfortunately, the two dead Navy men were burnt beyond any recognition, forcing Ducky and Jimmy to use dental records to get a positive identification on the two bodies.
A while later, Ari and Gibbs met again in a coffee shop in downtown D.C. with the men exchanging insults and with Gibbs promising to kill Ari if he went after Kate again. However, Gibbs had spotted the bomb in time and managed to throw it into a dumpster seconds before it exploded.
Some time later, in MTAC with Kate, Tony and Fornell in attendance, Gibbs called Ari and announced of his intentions to resign from NCIS. During that call, Gibbs's suspicious were confirmed: Ari was not looking for the terrorist cell as the FBI had hoped he would: he was in fact the cell's leader.
After determining Ari's location which was in downtown Norfolk, the NCIS team rallied and headed to a warehouse in the area where they engaged in a vicious and intense gunfight against the remaining members of Ari's terrorist cell with the terrorists themselves no match for the NCIS team's quick reflexes.
Eventually, all the terrorists were killed and the drone that was going to be used to attack the Navy ships containing numerous sailors returning from the Gulf was destroyed.
However, as Gibbs, Kate and Tony stood around, celebrating their success, things took a tragic turn when Kate was fatally shot in the head, the brutal force as well as the impact of the bullet killing her instantly with her blood splashing onto Tony who had been standing next to her.
- "Sorry, Caitlin."
- —Ari just mere seconds after killing Kate in the Season 2 finale, Twilight.
It was later revealed that Ari himself was responsible for Kate's murder which left Gibbs completely stunned.
NCIS Season 3Edit
In Kill Ari Part 1 (episode), as the NCIS team mourned Kate, Ari attempted to kill Abby by shooting rounds into the lab but Tony saved Abby.
Ari later led Gibbs and Jenny on a wild-goose chase across the city by sending a man named Mohamed Esfir after the two NCIS personnel.
With the team distracted, Ari later lured Ducky into a meeting by kidnapping Gerald once again.
- "Sorry to spoil your-."
- —Ari's final words just seconds before he is shot dead.
Ari's murderous rampage and need for revenge came to an end in "Kill Ari Part 2" where he was shot fatally in the head while attempting to kill Gibbs in the basement of Gibbs's own house, Ari had stolen Gibbs's rifle and planed to kill Gibbs with his own Marine Corps sniper rifle before ensuring the death would make sure that Gibbs had committed suicide.
As he raised the rifle to do so, Ari was shot and collapsed to the ground, dead with the person responsible for shooting him revealed to be none other than Ziva who had been listening from the doorway of Gibbs's basement the entire time finally realized that Ari was a rogue and a monster and she decided that she must kill him.
It was later shown that in a true twist of irony, much like how he had shot Marta and Kate in their own respective foreheads, Ari himself had been shot in the head as well.
It was also later revealed that Gibbs had arranged the entire plan with Ziva's backing.
At Kate's funeral in Indianapolis, Gibbs revealed to Jenny that Ziva was escorting Ari's remains back to Tel Aviv. It is also presumed that Ari was buried at a ceremony in Tel Aviv.
Ari was a tall, lean man of Middle Eastern descent with short black/brown hair and brown eyes.
Ari was skilled in using firearms and could also fire off a perfectly-timed as well as an accurate shot that was usually lethal without wasting any rounds.
- Unnamed H.R.T. agent #1 (shot to death by unnamed accomplice which Ari used as a distraction to escape).
- Marta (shot through the forehead with Kate Todd's weapon).
- Lieutenant Dean Westfall (shot in the chest by Virigina State Police Officer and had his hands removed as well with his index finger).
- Lieutenant Curtis Janssen (gunned down in the back as he attempted to escape from the car by Virigina State Police Officer, hands were also severed post-mortem).
- Caitlin Todd (held hostage during the morgue siege, later murdered her by shooting her in the forehead with a round from a sniper rifle nicknamed a "Kate").
- Gerald Jackson (held hostage, shot in the left shoulder with silenced pistol, survived).
- Donald Mallard (held hostage with Jackson, released without harm).
- Unnamed H.R.T. agent #2 (shot by unnamed accomplice which Ari used as a distraction to escape, survived).
- Timothy McGee (twice attempted, first with the car bomb by Virigina State Police Officer and second time during the gunfight at the warehouse in Norfolk).
- Anthony DiNozzo (attempted with the car bomb by Virigina State Police Officer, failed).
- Abigail Sciuto (attempted, fired a shot through her lab, failed).
- Leroy Jethro Gibbs (twice attempted, shot him in the shoulder in "Bête Noire" and later intended to kill with his own M40A1 sniper rifle in "Kill Ari Part 2").