"No thanks, doll face. I've already worn handcuffs."
A former member of the United States Marine Corps, Billy Coen was sentenced to death in his supposed role in the murder of 23 civilians during a mission in Africa. He was caught up in the events in the Arklay Forest while being transported for execution.
History
2nd Lieutenant Billy Coen was deployed in an insurgency mission during a civil war in Africa sometime in the summer of 1997 to raid a guerilla hideout somewhere in the jungle. Due to wrong information, Billy's team landed far off the target, and were subject to frequent enemy attacks and extremely harsh, scorching weather which left only four team members alive. Exhausted and angry, Billy's team soon found a local village filled with civilians. The other three members of Billy's team soon round up all of the village residents and opened fire. Billy attempted to stop the senseless murder, but received nothing but a rifle butt to the face. Upon returning, Billy was charged with the murder.
After being court martialled and senteced to death by a military tribunal, Billy was being transported through the Arklay Forest in a Military Police van on the night of July 23rd 1 when the Queen Leech, imbued with the persona of James Marcus, unleashed biological terror in the forest. After being attacked by unknown creatures (presumably Marcus' leeches), the van was knocked over and both drivers were killed. Seizing the opportunity, Billy broke one ring of his handcuffs and fled to the nearby Ecliptic Express.
While going through the train, Billy had a chance encounter with Rebecca Chambers and realizing S.T.A.R.S. now had an interest in him, left the scene only to rejoin Rebecca later in a proposition of partnership after realizing how dire the situation actually was. After saving her from a Mimicry Marcus, Billy and Rebecca formed a partnership. Through their efforts, they were able to stop the train, only to crash into the Umbrella Management Training Facility. After investigating further, the two learned of the hidden face of the Umbrella corporation.
Eventually, they came face to face with the Queen Leech itself, possessing the will of James Marcus. The persona of Marcus explained to them the reasons behind the outbreaks in the Arklay Forest, as well as revealing a hidden Umbrella conspiracy 10 years prior, after Ozwell E. Spencer ordered for Marcus' assassination.
After facing off against the Queen Leech's horrible mutated forms, Billy and Rebecca managed to escape the facility just prior to it's self-destruction. Casting off his handcuffs, Billy and Rebecca bid themselves farewell, and Billy later dissapeared into the forest.
Billy's current status is unknown, however, he is no longer pursued by any form of law enforcement after Rebecca Chambers filed her report on the incident, mentioning Coen's faked death in order to throw them off his trail 2.