A 34-year-old man from California faces the prospect of spending the rest of his life in prison for the brutal murder of his parents, which occurred nearly six years ago. The tragic incident unfolded after they staged an intervention urging him to seek treatment for his mental health and substance abuse issues.

The grim sequence of events continued the morning following the murders of his parents when Camden Burton Nicholson, then 27, also attacked and killed their housekeeper as she arrived for work by slashing her throat. On Wednesday, an Orange County jury found Nicholson guilty of three counts of first-degree murder in the deaths of his parents, 64-year-old Richard Nicholson and 61-year-old Kim Nicholson, as well as their housekeeper, 57-year-old Maria Morse. The jury also determined that Nicholson committed multiple murders, a special circumstance that could influence his sentencing.

After committing the murders, Nicholson took his parents’ vehicle and embarked on a series of shopping sprees. Prosecutors revealed that he spent hundreds of dollars at a marijuana dispensary in Santa Ana and purchased sex toys using his parents’ money.

During the trial, it was emphasized by prosecutors that Nicholson was entirely reliant on his parents for support, as reported by the Orange County Register. His parents had issued an ultimatum, threatening to cut off their support unless he addressed his addiction and mental health challenges.

The Orange County District Attorney’s Office provided further details in a news release, stating that on February 11, 2019, Nicholson confronted his father in their Newport Beach residence and fatally stabbed him multiple times.

He then dragged his father’s body into the bathroom and reportedly plugged the bottom of the door to prevent his father’s blood from seeping out the bottom and into the hall.

“When Nicholson’s mother returned home a few minutes later, he hit her with a metal statue and repeatedly stabbed her, killing her in the garage,” prosecutors wrote. “The next morning, Nicholson attacked the family’s longtime housekeeper, Maria Morse, when she arrived to clean the house. Nicholson stabbed Morse repeatedly and slit her throat before stuffing her body in a large plastic bin in the kitchen pantry.”

The morning after he killed Morse, authorities said Nicholson stole his father’s car and drove to a Kaiser Permanente facility in Irvine. He called 911 from the facility and told the emergency dispatcher had killed his parents, claiming he did so in self-defense “because they were trying to kill him.”

Officers with the Newport Beach Police Department then conducted a welfare check on the Nicholson home, which they described as being in “disarray” with “blood throughout the house.” All three victims were still inside.

The sanity phase of Nicholson’s trial, which will determine whether he was criminally insane at the time of the murders, began on Thursday.