Liam Patrick Coyle was a former arms dealer dealing weapons who was also a person of interest in the investigation into the death of Marine Nick Chandler.
Formerly an arms dealer by trade, Coyle raised money and smuggled weapons to Northern Ireland in the 1990s.
After the peace treaty broke out, Coyle went freelance, selling weapons everywhere from Chechnya to the Horn of Africa.
He paid the Kass brothers to kill Marine Nick Chandler, triggering a joint investigation between the Major Case Response Team and the Office of Special Project unit in Los Angeles.
Coyle was later killed in a gunfight between himself, his men and G. Callen, Lara Macy and Leroy Jethro Gibbs of NCIS with Callen later going undercover as the deceased arms and he attended a meet where it was revealed that the other buyer was none other than Michael Rivkin, an agent working for Mossad and who had connections to Ziva David.