He fell in love with a French woman named Sophia who he met while serving in the army in Afghanistan, Billy wanted to leave the team, but was killed by Jean Vilain during a mission with them in what would have been his last month on the team.
The team then avenged Billy by tracking Vilain and the Sangs, to put a stop to his plot and avenge their fallen ally. Barney Ross (who he looked up to as a father figure) personally engaged Vilain in hand-to-hand combat and defeated him.
Billy joined the SASR at some point. He served as a designed marksmen for his squad. One day, Billy and his squad were fighting in a valley in Afghanstian. After a three-hour engagement, his squad was killed with him being the sole survivor.
After the fatal day Billy's day proven to worst when he had found out that a stray dog that he had taken in, was killed by orders of the General. He stated that animals were not allowed on base and shot dead prior to his return. After this horrible day, decided to leave the Military.
Joining the Expendables
Sometime later Billy met Expendables, a mercenary team, who offered him a spot alongside the team. He decided that he could use the job let-alone the money for his girlfriend; Sophia.
- Liam Hemsworth was originally cast as a sniper in The Expendables, but the character was deleted from the script and later recycled into Gunner Jensen. Stallone, however, remained in contact with Hemsworth and promised him a role in a possible sequel.
- He has the similar appearance to the character Piers Nivans from Resident Evil 6, both look alike and share the same skill set (both are snipers and die.)
- His surname "Timmons" suggests Irish ancestry.