Nick Reiner shows ‘almost childlike’ behavior in jail after parents’ deaths, documentary reveals

The documentary claimed that Nick Reiner’s mental state deteriorated after medication changes, affecting his ability to stand trial
PUBLISHED JAN 21, 2026
Nick Reiner was unfit for trial after medication changes, which left him mentally unstable and exhibiting childlike behavior following his parents’ deaths (Getty Images)
Nick Reiner was unfit for trial after medication changes, which left him mentally unstable and exhibiting childlike behavior following his parents’ deaths (Getty Images)

LOS ANGELES, CALIFORNIA: Nick Reiner, the 32‑year‑old son of director Rob Reiner and his wife Michele, is being described in jail as “almost childlike” following the alleged murders of his parents.

According to a new TMZ Investigates documentary airing on Fox Nation, sources say Nick is not mentally capable of understanding his situation or standing trial as authorities continue to investigate the brutal deaths of the beloved couple.

Nick Reiner attends AOL Build Speaker Series at AOL Studios In New York on May 4, 2016 in New York City. (Photo by Laura Cavanaugh/FilmMagic)
Nick Reiner attends AOL Build Speaker Series at AOL Studios In New York on May 4, 2016 in New York City (Laura Cavanaugh/FilmMagic) 

Nick Reiner’s behavior in jail after parents’ alleged murders

New details revealed in the documentary paint a troubling picture of Nick's state of mind following the deaths of his parents. Sources tell the special that Nick “is in no mental state to stand trial” and is currently exhibiting childlike behavior while incarcerated said TMZ executive producer Harvey Levin.

According to the documentary coverage highlighted, Nick reportedly struggles to process the consequences of the alleged murders. While he is aware of what he is accused of doing, sources say he cannot fully grasp where he is or what is happening, leading those familiar with his condition to describe his behavior as “out of his head.”

Doctors had adjusted Nick’s medication a month prior to the murders in response to his complaints of weight gain, and Levin explained that the change “messed Nick up.” 

Rob Reiner and Michele Singer Reiner arrive on the red carpet at the State Department for the Kennedy Center Honors gala dinner, Dec. 2, 2023, in Washington. (AP Photo/Kevin Wolf, File)
Rob Reiner and Michele Singer Reiner arrive on the red carpet at the State Department for the Kennedy Center Honors gala dinner, Dec. 2, 2023, in Washington (AP Photo/Kevin Wolf, File)

He added that Nick had been diagnosed with schizoaffective disorder, a condition that can lead to delusions, hallucinations, and mood instability. Levin characterized the alleged murders as “incredibly brutal.”

He further highlighted the shocking nature of the crime, “We know people in the medical examiner’s office who are traumatized just by the pictures.”

LOS ANGELES, CA - AUGUST 09: Actor/Producer/Director Rob Reiner (center) and wife Michele Singer (L) and son Nick Reiner (R) attend Teen Vogue's Back-to-School Saturday kick-off event at The Grove on August 9, 2013 in Los Angeles, California. (Photo by Michael Buckner/Getty Images for Teen Vogue)
Rob Reiner  and wife Michele Singer and son Nick Reiner attend Teen Vogue's Back-to-School Saturday kick-off event at The Grove on August 9, 2013 in Los Angeles, California (Michael Buckner/Getty Images)

Nick Reiner’s case and the documentary’s revelations

Levin stated that the killings had “all the markings of a meth murder” and noted that Nick had been using meth when he was “off the rails” following his medication change, adding that he was ultimately arrested in a drug den.

He continued, “It has the markings of somebody who was just wild, wildly strong. We have not gotten the confirmation of that, but we’ve talked to people… If he were just Nick Reiner without something additional, the carnage wouldn’t have been the way it was.”

NEW YORK, NY - APRIL 28: Honoree Rob Reiner poses with family at the 41st Annual Chaplin Award Gala at Avery Fisher Hall at Lincoln Center for the Performing Arts on April 28, 2014, in New York City. (Photo by Michael Loccisano/Getty Images)
Rob Reiner poses with family at the 41st Annual Chaplin Award Gala at Avery Fisher Hall at Lincoln Center for the Performing Arts on April 28, 2014, in New York City (Michael Loccisano/Getty Images)

Given the mounting case against Nick, Levin also addressed why Alan Jackson, the high-profile attorney who had previously represented him before withdrawing from the case, continues to assert his client’s innocence.

He also explained, “[Jackson] says [Nick] is not guilty. What he’s really saying is, not guilty by reason of insanity. And I think that’s gonna be the plea in this case, because there’s no way he’ll plead not guilty.”

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