John Matuszak as "Sloth", a large and deformed Fratelli brother of immense strength, held prisoner in a room by his mother and often teased and tormented by his siblings. It is revealed later in the film that he is deformed because Ma dropped him several times when he was a baby. A pivotal moment in the film occurs when he rips his outer shirt open, revealing a t-shirt with the Superman logo underneath. The character is often remembered for his catchphrase, "Hey You Guys!"
John Daniel Matuszak (October 25, 1950 - June 17, 1989), nicknamed Tooz, was an American football player in the NFL who later became an actor. He was the first draft pick of 1973 and played most of his career with the Oakland Raiders until he retired after winning his second Super Bowl in 1981. Matuszak participated in the 1978 World's Strongest Man competition, where he placed 9th. As an actor, he is probably most remembered as deformed Sloth in The Goonies (1985).
Matuszak died of heart failure in Burbank, California in June 1989. He was only 38 years old, and his early death has been blamed on his lifestyle, including the possible use of anabolic steroids.
However, his sister also died at an early age due to heart failure, which suggests that a genetic heart disorder may have caused his premature death.