Dominic Vail (also called "Dom") was an NCIS agent working out of the agency's Office of Special Projects in Los Angeles. He was the rookie member of the team that included G. Callen, Sam Hanna, Kensi Blye, Eric Beale, and Nate Getz up until his disappearance in the NCIS: Los Angeles Season 1 episode, "Missing" and eventual death in the episode, "Found" which left the OSP team devastated.
Agent Vail was introduced in the episode "Identity" as the team's rookie agent and as such, was originally partnered with Kensi Blye.
Dom is not a native of Los Angeles. An MIT alumnus, Dom moved to straight to LA after he was recruited by NCIS following graduation.
Dom's field of study has not been disclosed, although he has demonstrated on several occasions advanced skills with computers and electronics with Tech Operator Eric Beale stating that he "makes a pretty good geek for a field agent".
As of season 1, both of Dom's parents are still alive. Dom is an uncle, as evidenced by crayon drawings stuck to his refrigerator door.
Despite being the Probie, Dom eventually grew used to the team and even formed friendships with his colleagues, including his partner, Kensi Blye. Unfortunately, Dom's career which lasted for a year ended rather abruptly when he disappeared in the episode "Past Lives".
In the next episode, "Missing", his team did not realize this they all received an agent needs assistance call and as such, finally discovered what had happened. However, their attempts at finding any trace of Dom went cold quickly, forcing the team to adjust to Dom's disappearance while Callen later issued a Missing Persons report for Dom.
Finally, in the episode "Found", the team found a lead that led them straight to Dom. It was revealed that he had been captured by professional kidnappers hired by Islamic militants and held hostage in the hope of facilitating a prisoner exchange.
Although Callen, Kensi and Sam eventually found him, having discovered that Dom was in Los Angeles all along, they later found themselves caught up in a major gunfight against the terrorists.
While this was going on, Dom spotted another terrorist and screaming Sam's name, rushed into the line of fire, taking the hit, essentially sacrificing himself to save Sam's life before falling to the ground, bleeding and suffering fatal injuries.
Sam dragged Dom to safety before he finished off the first terrorist while Kensi shot the second terrorist and Callen posing as one of Kalil Abramson men's shot Abramson before he and Sam rushed to Dom's aid, performing CPR.
Despite Sam and Callen's efforts to stop the bleeding, Dom died almost immediately with his death leaving the OSP team completely shell-shocked and grief-stricken as they had all voiced a hope of having Dom returned safe and sound to his family.
In the aftermath of the tragedy, Sam and Kensi were seen crying, obviously distraught while in the main OSP office, the rest of the team watched in disbelief as the events unfolded before them. Hetty left the Ops Centre, distraught and later attempted to resign from being the Operations Manager in the next episode, "Hunted" but thanks to Callen recovering her resignation letter from Vance, she stayed on.
Dom's role in the team and his position as Kensi's partner was later taken over by LAPD Detective Marty Deeks.
Vail did not appear in either Legend Part 1 (episode) or Legend Part 2 (episode), both of which served as the series pilot for NCIS: Los Angeles. Vail's first appearance was in "Identity," the premiere episode of NCIS: Los Angeles which interestingly enough also marked the debut appearance of Henrietta Lange.
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