Acting and directing career
Colasanto is best known for his role as Coach Ernie Pantusso, a character in the television sitcom Cheers. His early acting career included a theatrical play A Hatful of Rain (1956), starring Ben Gazzarra, and another role that earned him an Obie Award nomination in 1962. He also directed episodes of many television series, including Hawaii Five-O, Starsky & Hutch, The Streets of San Francisco, Bonanza, Columbo, and CHiPs. He also appeared in feature films, including The Counterfeit Killer (1968), Fat City (1972), and Alfred Hitchcock's Family Plot (1976).
Colasanto was in demand as an actor and director, but in the mid-1970s he was diagnosed with heart disease, which was exacerbated by his alcoholism. After twenty years of alcoholism, he became an active member of Alcoholics Anonymous from March 31, 1976, and became sober in the same year. In the late 1970s, he began having difficulty securing directing jobs as his health was declining. His last major film role was as mob boss Tommy Como in Raging Bull (1980).
Colasanto was preparing to retire when the role of Coach Ernie Pantusso was offered to him on Cheers. Coach would become his best known role. By the third season of Cheers, Colasanto's health had seriously deteriorated. His fellow cast members noticed his weight loss, but Colasanto kept the severity of his illness secret. Shortly after the Christmas holiday in 1984, he was admitted to a local hospital for water in his lungs. Co-star Ted Danson later said Colasanto had difficulty remembering his lines during production of the season.
When Colasanto was released from the hospital in the week of January 28 – February 3, 1985, after a two-week stay, his doctor recommended he not return to work. Although he appeared in the cold opening of the third-season finale episode "Rescue Me" (1985), Colasanto's last full episode was "Cheerio Cheers" (1985), which was filmed in late November 1984.