Peppard gave up drinking in 1978 and spent his later
years trying to assist other alcoholics with
recovering.
A life-long smoker, Peppard was diagnosed with lung cancer in 1992 and subsequently quit. Cancer never forced his retirement from acting, and Peppard completed a pilot for a new series in 1994 (a Matlock spin-off) shortly before his death.
Peppard died on May 8, 1994, in Los Angeles, California. Although he was still being treated for lung cancer, the direct cause of death was a complication arising from the treatment he was getting - chemotherapy-induced leukemia.[2]
