John Belushi and Tim Matheson in a scene from “Animal House.” ©Universal/Courtesy Everett Collection In his book, Matheson was adamant that Belushi wasn’t using drugs while filming.

On March 5, 1982, "Saturday Night Live" star John Belushi shot a “speedball," a mixture of coke and heroin. He was found dead at the Chateau Marmont in Los Angeles.