Liam

Liam (surname unrevealed) was an international criminal who assisted Ian Doyle in his crimes. He appeared in Season Six of Criminal Minds.

Background
An Irish citizen and nationalist, Liam once worked alongside Ian Doyle in the IRA. Their work relationship in a breakaway faction of the army (and later during their crimes in Valhalla and Lauren) seemed to imply that the two trusted each other extensively and that Liam may have been a lieutenant under Doyle's command. When Emily Prentiss, then working with Interpol's profiler organization JTF-12, infiltrated Doyle's faction under the guise of "Lauren Reynolds", an arms dealer, Liam became distrustful of her and even informed Doyle that he had to get rid of her. However, he was unaware that Doyle and Prentiss had started a romantic relationship in secret. It is unknown what happened to Liam when Doyle was first arrested and subsequently imprisoned at a North Korean political prison for the next seven years.

Valhalla
Liam was one of the few members of Doyle's faction who returned to support their leader upon his escape from prison in 2011. He and another member broke into the Fagan residence and killed Frank and Kerry Fagan (the latter of whom was responsible for Doyle's incarceration) by tying them up and then asphyxiating both with a towel before covering their deaths up as a gas leak and subsequent house explosion. Liam then assisted Doyle and two other members as they ambushed Byron Delaney, another of Doyle's targets, and killed him. When confronted by Prentiss and Morgan, he and the other member shot at the two agents, engaging them in a shootout that left one member wounded. To prevent him from slowing the others down, Doyle shot and killed the wounded member, with Liam watching. Later, he accompanies Doyle as he stalks Prentiss. Disapproving of Doyle's current tactic, Liam advised that it was easier to just grab her, citing that she will just get away again if they keep it up, but Doyle replied "No" and told him to "have a little faith".

Lauren
Liam later assisted Doyle when he abducted and later tortured Prentiss. When the BAU later deduced where Prentiss was being held captive, later breaching the building, Liam and the guards tried to stop them, but they were all shot and killed by a SWAT team.

Modus Operandi
In Valhalla and Lauren, Liam usually operated with at least one partner, mostly Doyle. When he killed his known fatal victim, Kerry Fagan, he asphyxiated her with a towel and then covered up her death. He later fired at Prentiss and Morgan with an automatic AKMSU carbine rifle at Byron Delaney's house.

Profile
No profile was specifically made of Liam, since the BAU were focused mostly on Doyle and, to same extent, the IRA faction that he led.

Known Victims

 * Numerous unspecified crimes committed prior to Doyle's incarceration
 * 2011, Washington, D.C., U.S.:
 * March 4: Kerry Fagan
 * March 5: The shootout at Byron Delaney's house:
 * Emily Prentiss
 * Derek Morgan
 * March 7: An unnamed SWAT agent

Appearances

 * Season Six
 * Valhalla
 * Lauren