His final appearance on Perry Mason, "The Case of the Sleepy Slayer", and his last film, Guns of Diablo, in which he was cast as Ray Macklin, were released in 1964 and 1965, respectively, after Ankrum's death.
Seine letzte Erscheinung in Perry Mason, "The Case of the Sleepy Slayer", und sein letzter Film, Guns of Diablo, in dem er Ray Macklin spielte, wurden nach seinem Tod in den Jahren 1964 und 1965 veröffentlicht.