Rob Reiner and his wife Michele Singer were found dead in their Brentwood home, their son Nick arrested on murder charges amid a long history of addiction and violence, and the handling of the case by authorities and public figures has already stirred controversy.

Famed Hollywood director Rob Reiner, 78, and his wife, Michele Singer, 70, were discovered dead in their Brentwood residence by their daughter, Romy Reiner. Their throats were reportedly cut, and Romy told authorities that a family member was responsible for the killings. Nick Reiner was arrested hours later and is charged with the murders, held on a $4 million bond. Reports note he has a history of mental health struggles and substance abuse.

Nick’s own admissions and past behavior have been well documented: he reportedly checked himself into rehab 17 times by the time he was 22. Initial reporting suggests the alleged killings occurred during a family altercation, and neighbors say his history of violence and addiction made a tragic escalation more likely. Those patterns — early and repeated treatment, episodes of violence, and ongoing instability — paint a picture that many say was a ticking time bomb.

Rob Reiner’s son Nick was notorious for being violent, and those around him “instantly knew’’ he was the one who allegedly murdered his parents, friends, and neighbors, told The Post on Monday.

“This is not the first time their son has been violent,’’ a longtime neighbor of the victims said of Nick Reiner, 32, who is charged with fatally slitting the throats of his parents in the family’s Los Angeles mansion.

“I know of another incident a few years back with Nick, but I won’t say more than that,’’ added the man, who declined to give his name. “I just never thought it would ever get to this point.

“Rob was always heartbroken that his son couldn’t beat his addiction,’’ the resident said of the famed actor-director and the long-drug-addled suspect.

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A former classmate of Nick’s told The Post that the suspect — who had been in and out of rehab since age 15 — has “always been troubled’’ and that she “instantly knew it was him’’ when she heard the news.

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A second neighbor of the parents added, “I wasn’t surprised’’ to learn Nick was charged with killing his famed Hollywood actor, 78, and director dad and wife Michele, 68. The resident declined to elaborate.

A security guard hired by the community to patrol the family’s ritzy Brentwood hood because of looting after the Palisades Fire in January told The Post that Nick had been living with his parents for at least the past year.

“You could tell something was a little off with him,’’ the worker, Trevor Taufahema, said of the suspected killer son.

The scene after the discovery raised questions about official communication. The Reiner family confirmed the couple’s deaths before an LAPD press briefing, and even the governor’s office issued condolences, yet the police initially declined to confirm the victims’ identities. That hesitation created an awkward, confusing media moment and left people wondering why an early, direct confirmation was stalled.

For many watching, the case highlights failures across systems that deal with addiction and mental illness. Repeated entries to rehab, neighbors’ warnings, and ongoing volatility in public settings suggest the support network around Nick was strained or ineffective. Those gaps matter because they can precede catastrophic outcomes when interventions fail or never fully stick.

Public reaction has been intense and polarized, with tributes pouring in from colleagues and admirers mourning a prominent director and his partner. At the same time, the lack of comment from some high-profile figures has been noticed and criticized, and that silence has fed debates about political allegiances and selective sympathy. On top of grief, the family now faces criminal proceedings and intense public scrutiny.

The legal process will move forward with prosecutors, defense counsel, and investigators parsing a painful set of facts and histories. As criminal charges proceed, details about motive and mental state will be central to both the prosecution and the defense. Meanwhile, neighbors and friends are left asking how warning signs were missed and what might have been done to prevent the loss of two lives.