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July 11 (UPI) -- Former child actor Benji Gregory, best known as ALF's Brian Tanner, has died, his sister confirmed in a social media post.

Gregory and his service dog, Hans, were found dead in the actor's car, his sister Rebecca Hertzberg- Pfaffinger said. The cause of death remains unclear. Gregory was 46 years old.

The car was discovered June 13 in a bank parking lot in Peoria, Ariz.