IntroductionRay wants a witness called McAffrey to be eliminated. He's under police surveillance at an apartment.
Catch This...You'll need some grenades for this mission, so head to Ammu-Nation first. Once you've picked them up go to the apartment near the Pay N' Spray. Now the tricky part. You need to throw a grenade in the open window in order to flush the witness out. Once you've wasted enough grenades and finally got one in, get back in your vehicle quickly as you're about to give chase to the witness in an escape vehicle. Chase after him and drive by his vehicle until it blows up to complete the mission.
Additional NotesTry parking a heavy vehicle outside of McAffrey's garage to prevent a fast getaway.