Roy Del Ruth [SEP] cause of death
five years, Del Ruth returned to helm the horror picture "The Alligator People" (1959), a bizarre tale about humans being partially transformed into alligators in the Deep South. After his film "Why Must I Die?" (1960), Del Ruth retired.
Death.
Roy Del Ruth died on April 27, 1961 at 67 years of age from a heart attack and was interred in the San Fernando Mission Cemetery in Mission Hills, Los Angeles, California. For his contributions to the motion picture
award-winning cinematographer Thomas Del Ruth  and was married to film director Roy Del Ruth until his death in 1961. She died in 1971, aged 71, and was interred in the San Fernando Mission Cemetery.
Further reading.
Lightner, David L. (2016) "Winnie Lightner: Tomboy of the Talkies". University of Mississippi Press. .