Cause of death – Gallagher died early Friday morning in the Palm Springs area while receiving hospice care, according to TMZ.
The outlet reported that the comedian suffered severe organ failure and had been ill for some time, having had several heart attacks over the years.
Gallager was well-known for his observational and prop comedy catchphrases, as well as his act that included smashing watermelons.
He has 13 one-hour Showtime comedy specials and several well-liked HBO specials.
The mononymous comedian, born Leo Anthony Gallagher Jr., rose to prominence in 1980 with “An Uncensored Evening,” the first standup comedy special to air on Showtime.
Gallagher went on to write 12 more hour-long specials for the network, as well as several popular HBO shows.
Gallagher’s signature bit involved a handmade sledgehammer he called the “Sledge-O-Matic,” which he would use to smash food onstage and spray it onto the audience.
His hammer’s trademark victim was the watermelon. Gallagher also became famous for his witty wordplay and sharp observational comedy.