STORY and MISSABLE
When you take control of Carlos for the first time, the first zombie you'll have to face will be Jill Valentine's partner from the S.T.A.R.S. Aplha Team who was bitten during the first part of the game.
This trophy is missable if you enter the police station without killing Zombie Brad and use the detonator at the 2F. If for some reason you entered the station without getting the trophy, you will be able to go back outside and kill Zombie Brad before using the detonator. Additionally, at Nightmare/Inferno difficulties, you will have one extra chance as Brad appears again at the 1F Safety Deposit Room after you get the battery for the detonator.