The last murder of a rocker I heard about was quite a while back: After their heyday in the 80's, one of the two members of Los Angeles' House Of Freaks moved back to N. Carolina, bought a house, and had a couple of kids with his wife. One day a couple of guys did a home invasion of the family, tying them up in the basement and slitting all their throats, then robbing the house.
These murders also had no FBI involvement, of course.