Keyes is part of Rhino 2-3 squad reconning the USS Sulaco, captured by Aliens and released by Winter in singleplayer and continuing with him until he detonates a grenade destroying the umbilical connecting the two spacecrafts together causing a depressurization making both spacecraft unstable and killing him and the emerging Chest Burster.
Reference stats table.
Appearances in the following;
Aliens: Colonial Marines
Keyes assists with the recon of the USS Sulaco on arrival at LV426 only to be cocooned by Aliens but later released by Corporal C.Winter. Winter and Keyes continue together and track down the fight recorder, they then meet up with O'Neal and Paluski to battle the aliens defending the Cargo Bay, as they clear it and escape Paluski and Keyes die as the umbilical is destroyed, Winter narrowly avoids death and returns to the Cargo Bay as Reid lands a Cheyenne to finish the level.