Rob Reiner’s younger son, Nick Reiner, was in police custody Monday for what investigators believe was the fatal stabbing of the director-actor and his wife at their Los Angeles home a day earlier, police said.

Police Chief Jim McDonnell said Nick Reiner, 32, was “booked for murder” and was being held on $4 million bail in connection with the deaths of his parents. McDonnell said the department’s robbery and homicide division is handling the investigation.

“They worked throughout the night on this case and were able to take into custody Nick Reiner, a suspect in this case,” McDonnell said.

He called the deaths “a very tragic incident.”

Representatives for Reiner’s family did not immediately respond to a request for comment, and it was not immediately clear whether Nick Reiner had an attorney who could speak on his behalf.

Nick Reiner has spoken publicly of his struggles with addiction. By 18, he had cycled in and out of treatment facilities with bouts of homelessness and relapses in between. Rob and Nick Reiner explored their difficult relationship and Nick Reiner’s struggles with drugs in a 2016 semi-autobiographical film, “Being Charlie.”

Nick Reiner had argued with his parents at a party on Saturday evening, the Los Angeles Times reported.

Rob and Michele........

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