According to Laura Wagner in her article on Onslow in Films of the Golden Age, Issue #81, Summer 2015, Onslow, suffering from a serious heart ailment, was checked into the Hacienda Convalescent Hospital in Van Nuys, California, in the fall of 1976, by his wife. In November, he was brutally pushed by another patient and suffered a broken hip from the fall. An ambulance was called and Onslow was "treated" at a nearby hospital. His wife claims he was grossly neglected, developed pneumonia, and died. An inquest was held by the coroner and it was determined that he died "at the hands of another, other than by accident." Charges were brought up but they eventually were dropped.
