Someone has to dedicate their life to Jehovah, then symbolize that dedication by water baptism. (Mark 1:9, 10; John 3:23; Acts 19:4, 5) Once they are baptized they are now qualified to be called one of Jehovah's Witnesses. The fact that he NEVER did this means he was never a witness. Michael's mother Katherine Esther Scruse, on the other hand, is a baptized witness of Jehovah.
A witness of Jehovah (Isaiah 43:10)