Benji Gregory, who starred as a child in the hit television series “ALF” in the 1980s, has died. He was 46.

His death was confirmed by his sister, Rebecca Pfaffinger, who said that an official cause of death was still pending.

According to Mrs. Pfaffinger, Mr. Gregory and his service dog, Hans, were found dead in his car on June 13 at a bank’s parking lot in Peoria, Ariz. She said in a Facebook post that he had fallen asleep in the vehicle and had died of heatstroke.

Mr. Gregory was best known for his role as Brian Tanner on “ALF,” an NBC sitcom that premiered in September 1986, when he was 8. The show featured a suburban family whose world is thrown upside down when a back-talking, pointy-eared alien from the planet Melmac crash-lands through their garage. The Tanner family calls the alien ALF, short for Alien Life Form, and he stays with them, causing mischief and voicing his observations about humankind. “ALF” was a hit and aired for four seasons.

“It became quite natural to interact with ALF,” Mr. Gregory said of the experience in a 2022 interview with BTM Legends Corner, a show on YouTube.

He was born Benjamin Gregory Hertzberg on May 26, 1978, in the Los Angeles area, according to his IMDB profile.

Alongside “ALF,” Mr. Gregory appeared in a string of other hit shows in the 1980s, including “The A-Team,” “Punky Brewster” and “Amazing Stories.”

Mr. Gregory’s film credits include “Jumpin’ Jack Flash,” a 1986 comedy about a lonely computer programmer in Manhattan played by Whoopi Goldberg, and the 1993 animated movie “Once Upon a Forest.”

He eventually moved on from acting and in 2004 became an aerographer’s mate for the U.S. Navy stationed in Biloxi, Miss., according to IMDB.

He had lived with bipolar disorder and depression and received care for both, his sister said.