I don't believe Charles Fizer, the member in question, belonged to the group at the time of the riot. I read that he was shot when he drove his mother's 1956 Buick through a police barricade.
I'll have to recheck Conot's book to get the details.
Here is a music+riot trivia question for you
Several members of what famous R and B group from the Seventies were involved in a tragic incident stemming from the huge 1967 Detroit riot?