ap photo Rob Reiner, from left, Michele Singer Reiner, Romy Reiner, Nick Reiner, Maria Gilfillan, and Jake Reiner arrive at the premiere of “Spinal Tap II: The End Continues” on Sept. 9 at The Egyptian Theatre Hollywood in Los Angeles.

LOS ANGELES — The 32-year-old son of Hollywood icon Rob Reiner was arrested on suspicion of murder and held without bail Monday in the stabbing deaths of his parents in their Los Angeles home, authorities said.

The case will be given to prosecutors on Tuesday as they consider formal charges against Nick Reiner, who was taken into custody hours after Rob Reiner and Michele Singer Reiner were found dead. Police haven’t said anything about a motive for the killings.

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

Rob and Nick Reiner had explored their difficult relationship and Nick Reiner’s struggles with drugs in a semi-autobiographical 2016 film, ” Being Charlie.” 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.

The bodies were discovered Sunday afternoon at the home in the upscale Brentwood neighborhood, and investigators believe they were stabbed, a law enforcement official told The Associated Press. The official, who was briefed on the investigation, could not publicly discuss the details and spoke to the AP on condition of anonymity.

Reiner was long one of the most prolific directors in Hollywood, and his work included some of the most memorable movies of the 1980s and ’90s, including “This is Spinal Tap,” “A Few Good Men,” “When Harry Met Sally” and “The Princess Bride.”

His role as Michael “Meathead” Stivic in Norman Lear’s 1970s TV classic “All in the Family” as a liberal foil to Carroll O’Connor’s Archie Bunker catapulted him to fame and won him two Emmy Awards.

The son of comedy legend Carl Reiner, Rob Reiner married photographer Michele Singer Reiner in 1989. The two met while he was directing “When Harry Met Sally.” They had three children together: Nick, Jake and Romy.

Reiner told The New York Times in 1989 that the cinematographer on “When Harry Met Sally,” Barry Sonnenfeld, predicted he would marry her. “I look over and I see this girl, and whoo! I was attracted immediately,” Reiner said.

Michele Singer Reiner was a producer for “Spinal Tap II: The End Continues,” “God & Country,” “Albert Brooks: Defending My Life” and “Shock and Awe,” according to IMDB. Earlier in her career, she photographed the cover image of President Donald Trump’s 1987 bestseller “The Art of the Deal.”

Trump on Monday blamed Rob Reiner’s outspoken opposition to the president for the actor-director’s killing, delivering the unsubstantiated claim in a social media post that seemed intent on decrying his opponents even in the face of a tragedy.