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Nick Reiner lay in wait for his movie director father Rob and mother Michelle before knifing them to death, a newly-unsealed indictment alleges.

Reiner, 32, was formally indicted for the December 2025 murders of his parents at their $13.5m mansion last month, with the document unsealed Wednesday.

The new indictment adds the allegation of laying in wait to previous murder allegations that Reiner has faced.

That is a special circumstance which could make Reiner eligible for life without parole or even the death penalty if he is convicted.

Reiner has denied the allegations made against him.

The Los Angeles District Attorney's Office announced the charges, alongside another allegation that he used a dangerous and deadly weapon when he allegedly killed the 'This is Spinal Tap' director, 78, and his mother, 70.

Reiner remains held on no bond and is next set to appear in court for a pretrial hearing in September.

The Hollywood heir, who has a long history of mental health and substance abuse issues, had earlier been seen having a loud argument with his father at a holiday party thrown by Conan O’Brien hours before his parents’ bodies were found, reportedly by his younger sister Romy.

A Los Angeles County grand jury indicted the 32-year-old on murder charges in relation to the stabbing killings of his parents, he has pleaded not guilty

The Los Angeles District Attorney's Office announced the charges, alongside another allegation that he used a dangerous and deadly weapon when he allegedly killed the 'This is Spinal Tap' director, 78, and his mother, 70

Nathan Hochman, the LA County District Attorney, has said that the death penalty is on the table for Reiner if he is convicted.

He previously said: ‘This case is a death penalty eligible case. Along those lines, we take the process in which we determine whether or not the death penalty should be sought extremely seriously. That goes through a very rigorous process.

'We will be looking at all mitigating and aggravating circumstances, and we have invited defense counsel to present to us both in writing and in a pleading any arguments they would like to make in consideration going forward or not going forward with the death penalty. So that is an ongoing process.'

California has not executed a death row prisoner since 2006 and Governor Gavin Newsom enacted a moratorium on the punishment in 2019, meaning Reiner will be unlikely to ever face the death penalty even if it is ultimately sentenced to it.

In a heart-wrenching essay in April, Reiner's older brother Jake shared his horror at finding out that his beloved parents, who were married for 36 years, had been murdered and that his younger brother Reiner was charged with their slayings.

He described how his sister Romy, 28, gave him the terrible news, which he said was 'too devastating to comprehend.'

'The only thing I could focus on was that I needed to get to my childhood home. I needed to get to my sister. I needed to figure out what the hell just happened,' he recounted.

'I was robbed of so many things that day,' Jake, 34, continued. 'My parents won’t be at my wedding, they won’t get to hold their future grandchild, and they won’t get to see me have the successful career I’m still seeking. It simultaneously breaks my heart and enrages me.'

As he was still reeling from the news of his parents' deaths, Jake said he was horrified to then learn that his brother Reiner was the alleged murderer.

Rob Reiner (second from left) and his wife Michele Singer Reiner (left) are pictured in April 2014 with their kids Jake, Romy and Nick

Reiner had earlier been seen having a loud argument with his father at a holiday party thrown by Conan O’Brien hours before his parents’ bodies were found, reportedly by his sister

'We lost more than half of our family that night in the most violent way imaginable,' he wrote.

'Sure, any loss of a parent is devastating, but nothing compares to losing both of them at the same time and, on top of that, having your brother be at the center of it. It’s almost too impossible to process.'

'Every day since then has been horrendous,' he continued. 'Every meeting we take, every person we talk to, every tear we shed, every movement we make is connected to our parents being murdered.'

'When you are not living through a tragedy the specific way Romy and I are, it’s hard to wrap your head around just how horrific this has been,' Jake explained.

'Because they weren’t your parents, it might be easier to move forward or even forget for a moment about what happened that day,' he wrote. 'But for us, it’s every single day.'

Jake also paid touching tributes to his parents, saying that they were 'the center of my life.'

While his famous father was a Hollywood legend, Jake described his mother, Michele, as 'the engine, the backbone, and the heart of our entire family.'