Question: Which mass murderer was the Wilson brother who sang on "In the Back of My Mind" associated with?
Sentence (from "Akiyoshi Umekawa"): Akiyoshi Umekawa (梅川 昭美 , Umekawa Akiyoshi , March 1, 1948 – January 28, 1979) was a Japanese mass murderer who killed a woman on December 16, 1963, and shot dead four people on January 26, 1979.
Relevant evidence: No