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 and eventual death in May 2010 with his death leaving the OSP team devastated.
Presumably born in Alexandria, Virginia, Vail was the son of retired United States Army solider Martin Vail and Martin's wife, Lauren.
Dom is also an uncle which suggests that he either has a younger or older brother or sister.
Vail also attended high school and like fellow NCIS Special Agent Timothy McGee, Vail also went to MIT before choosing to join NCIS.
After undergoing the necessary training and passing, Dom was eventually reassigned to the Office of Special Projects, becoming agent Kensi Blye's second partner.
NCIS: Los Angeles Season 1Edit
Dom made his debut appearance in the NCIS: Los Angeles Season 1 premiere, "Identity" where he met G. Callen who returned a month after surviving an assassination attempt against him in the NCIS Season 6/NCIS: Los Angeles backdoor pilot episode, Legend Part 2 (episode).
In "Past Lives", Dom was ambushed and ultimately abducted by mysterious forces with the OSP team learning of his disappearance in the next episode, "Missing".
Despite their best efforts, the OSP team found no trace whatsoever of Dom and were left in distress, not knowing if Dom was alive or dead while Callen was forced to write up a report, officially classifying Dom as Missing in Action.
In the episode, "Found", OSP rushed to Dom's aid after learning that he was being hostage by a group of Islamic militants who were hoping to trigger 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 was later replaced by LAPD Detective Marty Deeks.
Like agent Timothy McGee and OSP Tech Operator, Eric Beale, Dom was extremely skilled at computers and technology.
Although Dom's time at the Office of Special Projects was short-lived, lasting for a year, his NCIS colleagues still mention him from time to time, suggesting that he has left a strong and long-lasting impression on them.
- Like NCIS Special Agent Caitlin Todd, Dom worked for NCIS for little over a year before eventually dying in the line of duty.
- Like Henrietta Lange, Marty Deeks and Nell Jones, Dom himself didn't appear in the NCIS Season 6/NCIS: Los Angeles backdoor pilot episodes, Legend Part 1 (episode) and Legend Part 2 (episode).
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