Sheehan died at his home in Big Horn, Wyoming, on June 29, the Kane Funeral Home announced via its website. His wife, Cate Abert, was with him when he passed away.
Several fans took to social media to mourn the actor following news of his death. "Very sad news," one user wrote via X on Monday, July 8. "Loved him as Joe. Ben & Val had some sweet moments but I was always wanting Gary & Val. We are losing too many beloved soap vets."
No other details have been shared. A cause of death has yet to be revealed.
Sheehan made his small screen acting debut in an episode of Charlie's Angels in 1978. The following year, he became a series regular on General Hospital, where he portrayed Joe Kelly.
While appearing on the long-running medical drama from 1979 to 1982, Sheehan's character was linked to Heather Webber (Robin Mattson) and Bobbie Spencer (Jacklyn Zeman).
He earned a Daytime Emmy Nomination for Outstanding Actor in a Supporting Role in a Daytime Drama Series for his performance in 1982.
After completing several years with General Hospital, Sheehan turned to Knots Landing. He portrayed reporter Ben Gibson in more than 100 episodes from 1983 to 1988. His character became the second husband of Valene Ewing (Joan Van Ark.)
Sheehan landed a gig as Brian Harper in Day by Day, which aired for two seasons on NBC. The series, which ran from 1988 to 1989, centered around Brian and Kate Harper (Linda Kelsey) and their son, Ross (Christopher Daniel Barnes.)
Sheehan made appearances in other shows, including the Clueless television series where he starred as Cher's father Mel Horowitz from 1997 to 1999. (He replaced Michael Lerner after the first season of the show, which featured faces including Rachel Blanchard, Elisa Donovan, Stacey Dash and Donald Faison.)
He also played Edward Spellman, the father of Melissa Joan Hart's Sabrina Spellman in Sabrina the Teenage Witch, for two episodes. (The sitcom followed Sabrina as she navigated high school and her powers as a witch and ultimately came to a close in April 2003.)
As for his personal life, NBC reported that Sheehan was married to Abert from 1981 until his death last month.
