On Sunday, Dec. 14, at about 3:30 p.m., the Los Angeles Fire Department (LAFD) was called to a home to provide medical aid, the LAFD told PEOPLE. Upon arrival, they found a man, 78, and a woman, 68, dead. Sources confirm the victims were Rob and Michele.

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In a 2016 interview with PEOPLE, Nick spoke about his years-long struggle with drug addiction, which began in his early teens and eventually left him living on the streets. He said he cycled in and out of rehab beginning around age 15, but as his addiction escalated, he drifted farther from home and spent significant stretches homeless in multiple states.

Nick told PEOPLE that the chaotic period of addiction — including nights and sometimes weeks sleeping outside — later became the basis for the semi-autobiographical film Being Charlie, which he co-wrote. “Now, I’ve been home for a really long time, and I’ve sort of gotten acclimated back to being in L.A. and being around my family," Nick told PEOPLE at the time.