Nick Reiner’s change in schizophrenia medication, which led to weight gain, reportedly triggered the events resulting in his parents Rob Reiner and Michele Singer Reiner’s murders. These claims surfaced in TMZ’s documentary “The Reiner Murders: What Really Happened,” released Friday. Sources revealed that Nick, 32, was diagnosed in 2020, and his medication adjustments in late 2025 allegedly caused erratic and dangerous behavior.
Insiders stated Nick’s mental health deteriorated significantly in the month before the killings, with his Los Angeles rehab facility altering his prescription after he complained about weight gain—a common side effect. The new medication purportedly worsened his instability. Despite awareness of their son’s alarming condition, Rob and Michele reportedly felt unsure how to intervene. Doctors also allegedly opted against placing Nick on an emergency psychiatric hold.
Rob, 78, and Michele, 70, were found fatally stabbed at their Los Angeles home on December 14, 2025, following a heated argument with Nick the prior evening. Nick, who had a history of addiction and familial conflict, was arrested hours later and faces two counts of first-degree murder. After switching lawyers from Alan Jackson to public defender Kimberly Greene, sources claim Nick now believes a “conspiracy” led to his incarceration. Despite acknowledging the allegations, he reportedly struggles with a break from reality. His arraignment was delayed again during a January 7 court appearance. Greene has not commented on the case.