Los Angeles Angels pitcher Dick Wantz dies following surgery for brain cancer. The 25-year-old Wantz had made his debut only one month earlier, pitching one inning in relief in his only major league appearance.

On May 13, 1965 — Los Angeles Angels pitcher Dick Wantz dies following surgery for brain cancer. The 25-year-old Wantz had made his debut only one month earlier, pitching one inning in relief in his only major league appearance.

Source:
Baseball Reference May 13