Rob Reiner and Michele Singer Reiner were found dead in their bedroom, a source with knowledge of the homicide investigation confirms to PEOPLE.

“They were found where they were murdered,” a source clarifies to PEOPLE.

The couple’s son, Nick Reiner, 32, is expected to face two counts of first-degree murder with a special circumstance of multiple murders, as well as a special allegation he used a “dangerous and deadly” weapon such as a knife, Los Angeles Los Angeles County District Attorney Nathan Hochman announced on Dec. 16.

The charges carry a maximum sentence of life in prison without parole or the death penalty, if convicted.

Nick is being held without bail. The suspect was expected to appear in Los Angeles court earlier on Tuesday but did not show since he has not been medically cleared, his defense attorney, Alan Jackson, told reporters outside the courthouse.

Rob, 78, and his wife, Michele, 70, were found dead in their Los Angeles home on Sunday, Dec. 14, by their daughter, Romy, multiple sources close to the family told PEOPLE.

Police said Nick was arrested without incident around 9:15 p.m. on Sunday — about six hours after the Los Angeles Fire Department said it was called to the Brentwood home to provide medical aid around 3:30 p.m.

Rob and Michele’s cause and time of death have not been made public by authorities. Hochman told reporters Tuesday that investigators are still awaiting autopsy results.

The Hollywood couple had been married since 1989. They met while Rob was directing When Harry Met Sally…, which was released that same year.

Together, they had three children, including Nick, who previously has spoken openly about struggles with addiction and homelessness, beginning in his teens.

Nick Reiner in 2024.

Denise Truscello/Getty

The night before the killings, Nick, Michelle, and Rob all attended a holiday party hosted by Conan O’Brien, where Nick and Rob got into a “big fight,” two sources who were at the party told PEOPLE.

“Nick was freaking everyone out, acting crazy, kept asking people if they were famous,” one of the sources said.