As far as Kitty Genovese goes, the first sentence of the OP says that “sometimes famous people die.” Kitty Genovese was a bartender. Not a famous person until she was killed.
Sharon Tate is a yes for me. Not a huge star, but she had been in some prominent releases, connected to other big people in the biz. And everyone remembered the death. Jay Sebring and the LaBiancas no, everyone else was overshadowed by Sharon Tate.
William Henry Harrison is a yes for me, JFK no. James Dean yes. Buddy Holly no, Valens and the Big Bopper yes.
There was an actress, Barbara Colby, was on the Mary Tyler Moore Show spinoff Phyllis. She and a fellow actor were shot and killed in a drive by shooting after an acting class. No known motive and the case has never been solved. But she was just on three episodes of the show, not quite prominent enough yet I think.
Peter Deuel was on a TV Show, Alias Smith And Jones, one of the co-leads, when he committed suicide. His role was re-cast and the show continued. Deuel had been on some other shows. He’d be a yes for me.
Stonewall Jackson, probably remembered more for dying than any military feats.