Rob Reiner, 78, and his wife Michele Singer Reiner, 68, were found dead in their Los Angeles home on Sunday, December 14. And, according to sources who spoke with People, the night before, the director and his son argued. The magazine reports that on the night of Saturday, December 13, the couple attended a Christmas party hosted by Conan O'Brien. There, Rob Reiner and his 32-year-old son, Nick Reiner, had a heated argument that was visible in front of other guests. A source described Nick's behavior at the party: "Nick was scaring everyone, acting like a madman, keeping asking people if they were famous." After the heated argument, Rob and Michele left the celebration, as confirmed by TMZ. Regarding the tragic death of the director and his wife: The tragic discovery occurred around 3:30 p.m. on Sunday, when emergency services responded to the family's residence to provide medical assistance. It was the couple's daughter, Romy Reiner, who found the bodies, according to sources close to the family cited by the same media outlet. TMZ also reported that both bodies had stab wounds. Hours later, authorities arrested Nick Reiner, who now faces murder charges and is being held without bail. Nick Reiner, the middle son of Rob and Michele, had spoken publicly with People in 2016 about his deep struggles with addiction and homelessness, problems that began at age 15. He recounted cycles of rehab and relapse, and how his addiction led him to distance himself from his family and spend long periods homeless in various states. His experience even served as partial inspiration for Being Charlie, the 2015 film he co-directed with his father.