Merry Christmas! I have a handful of minutes, lol.
What if it’s both? The agent who dies on his watch is also accused of stealing drugs (bad guys have to blame someone, why not the guy who can’t defend himself?)
He feels he needs to prove innocent the guy who believed HE was innocent the whole time?
Or make it more interesting, the guy thought he was guilty all that time, but your hero is better than that. He’s not going with the crowd–he’s been railroaded by that himself. He knows darn well the guy wouldn’t do that because of some things they dead guy said to him when everyone thought he was guilty.
There’s no insurance money if he’s guilty of a crime, and his family really needs the money.
Clear the name of the guy who died in the process of saving his life?