LOS ANGELES – Today, Nick Reiner is expected to face arraignment and declare his plea regarding the tragic deaths of his parents, Rob Reiner and Michele Singer Reiner.

The Los Angeles Superior Court hearing will occur just over three weeks after the acclaimed actor-director and his spouse of 36 years were discovered fatally stabbed in their Brentwood residence, according to authorities.

Hours following the incident, 32-year-old Nick Reiner, the youngest of Rob Reiner’s four children, was apprehended and has been detained without the possibility of bail. He was formally charged with two counts of first-degree murder two days after his arrest. During his initial court appearance on December 17, he did not enter a plea and appeared wearing shackles and a suicide prevention vest.

Alan Jackson, serving as Nick’s attorney, has yet to disclose any strategies for the defense. Typically, defendants in criminal proceedings enter a not guilty plea at this juncture. However, Jackson may request additional time before a plea is submitted.

Should Nick Reiner plead not guilty, the proceedings would usually advance to a preliminary hearing to assess whether sufficient evidence exists for a trial. Additionally, his mental fitness to face trial might become a relevant issue.

A decade ago, Nick Reiner publicly discussed his severe struggles with addiction and mental health after making a movie with his father, “Being Charlie,” that was very loosely based on their lives.

Rob Reiner, 78, and Michele Singer Reiner, 70, were killed early on the morning of Dec. 14, and they were found in the late afternoon, authorities said. The LA County Medical Examiner said in initial findings that they died from “multiple sharp force injuries,” but released no other details, and police have said nothing about possible motives.

Jackson is a high-profile defense attorney and former LA County prosecutor who represented Harvey Weinstein at his Los Angeles trial and Karen Read at her intensely followed trials in Massachusetts. After the initial Reiner hearing, Jackson called the case “a devastating tragedy.” He said the proceedings will be very complex and asked that the circumstances be met “not with a rush to judgment.”

The counts against Reiner come with special circumstances of multiple murders and an allegation that he used a dangerous weapon, a knife. The additions could mean a greater sentence.

Prosecutors have said they have not yet decided whether to seek the death penalty.

The prosecution is being led by Deputy District Attorney Habib Balian, whose recent cases included the Menendez brothers’ attempt at resentencing and the trial of Robert Durst.

Rob Reiner was a prolific director whose work included some of the most memorable and endlessly watchable movies of the 1980s and ’90s. His credits included “This is Spinal Tap,” “Stand By Me,” “A Few Good Men,” and “When Harry Met Sally,” during whose production he met Michele Singer, a photographer, and married her soon after.