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Rob Reiner’s troubled son Nick reportedly stormed off in a huff after a tiff with comedy heavyweight Bill Hader at Conan O’Brien’s Christmas party — which left other guests concerned.

Nick, who is accused of slaughtering his filmmaker dad and his mom in their Brentwood home sometime between Saturday night and Sunday afternoon, interrupted Hader at the holiday bash, an eyewitness told NBC News.


  Nick Reiner, who’s accused of killing his parents, Rob and Michele Reiner, allegedly “stormed off” after getting into a tiff with comedian Bill Hader at a Christmas party hosted by Conan O’Brien BACKGRID Nick Reiner, who’s accused of killing his parents, Rob and Michele Reiner, allegedly “stormed off” after getting into a tiff with comedian Bill Hader at a Christmas party hosted by Conan O’Brien BACKGRID

  Nick Reiner allegedly interrupted a conversation involving Hader (left, seen in November) at the Christmas party. When Hader told Reiner it was a private discussion, the alleged killer appeared to be “storming off.” BACKGRID Nick Reiner allegedly interrupted a conversation involving Hader (left, seen in November) at the Christmas party. When Hader told Reiner it was a private discussion, the alleged killer appeared to be “storming off.” BACKGRID

When the “SNL” alum told Nick that he was in the middle of a private conversation, the source said Nick just stood there and stared, before “storming off.”

The unsettling interaction concerned other partygoers, the source added.

Nick attended the star-studded event with parents Rob and Michele, where the trio also reportedly got into a“very loud argument’’ — possibly because Nick was back on drugs and refusing yet another go at treatment, sources told The Post on Monday.

Here’s the latest on the death of Rob Reiner:

The 32-year-old, who has openly discussed his battles with heroin and cocaine in various interviews, once estimated he had been to rehab at least 18 times since the age of 15.


  Michele and Rob Reiner in an undated photo. @michelereiner/Instagram Michele and Rob Reiner in an undated photo. @michelereiner/Instagram

“They had had an argument at Conan’s holiday party, and Rob had been telling people that they’re scared for Nick and scared that his mental state was deteriorating,’’ a lifelong family friend who lived near the Reiner home told The Post.

By the time law enforcement got to the Reiners’ home in Brentwood around 3:40 p.m. on Sunday, Rob and Michele appeared to have been dead for a few hours, according to TMZ.

They were both found with their throats slit in a grisly scene that could only be described as the actions of a “mad man,” the outlet reported.

The couple was found by 28-year-old daughter Romy, who told investigators that Nick “should be a suspect” because he’s “dangerous,” sources said.

Nick remained behind bars on Tuesday on suspicion of murdering the Hollywood legends that brought him into the world, waiting to be medically cleared to appear in court.

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