I'm researching my grandmother's family. Her uncle was shot to death in an alleyway (supposedly by the jealous husband of a mistress). I can't find him in the Social Security Death Index, but he was born in 1918 and served in WW2 so he (logically) should be in there. I would use newspaper research, but none of my family knows where or even when the murder happened. Any tips on what I could do?