One of Mr. Hagman’s more affecting roles was as Art Carney’s self-pitying son in “Harry and Tonto” (1974). He also appeared in “The Eagle Has Landed” (1976) and “Superman” (1978) and showed his comic talent in “Mother Juggs and Speed” (1976) as an oversexed ambulance driver working opposite Bill Cosby and Raquel Welch.

More recently, Mr. Hagman portrayed a Texas millionaire in “Nixon” (1995) and a governor in “Primary Colors” (1998).

He reprised the role of J.R. Ewing in a new version of “Dallas,” which debuted on TNT in June.

In 2005, Mr. Hagman’s wife was diagnosed with Alzheimer’s disease. She survives, along with two children.

For 25 years, Mr. Hagman observed “silent Sundays,” refusing to talk, a move he initially made to rest his voice. After giving up cigarettes, he often carried a hand-held fan to blow fumes back toward smokers.

He had long been known as an amiable eccentric who was considered the unofficial mayor of Malibu, where he lived for decades in an oceanfront home. He often led impromptu ragtag parades on the sand while wearing outlandish costumes and flew a flag from his deck that declared “Vita Celebratio Est” — “Life is a celebration.”