LOS ANGELES (AP) — A UCLA sleep expert described Dr. Conrad Murray’s use of a cocktail of drugs on Michael Jackson as “unethical, disturbing and beyond comprehension.”

The combination of drugs used as Jackson struggled to fall asleep on the day he died was a “recipe for disaster” and ultimately caused his death, Dr. Nader Kamangar testified Thursday.

Under questioning by Murray’s attorney, J. Michael Flanagan, the witness was asked to tell jurors what he knew about the events of June 25, 2009, the day of Jackson’s death.

“To summarize, Mr. Jackson was receiving very inappropriate therapy in a home setting, receiving very potent therapies without monitoring,” Kamangar said.

He said diazepam (Valium), lorazepam (Ativan) and midazolam (Versed) were given to the sleepless star during a 10-hour period throughout the night and morning.

“This cocktail was a recipe for disaster,” Kamangar said.

Noting the addition of propofol (Dipravan), a powerful anesthetic used in surgeries, Flanagan asked: “Could this have caused death?’

“Absolutely,” Kamangar said. “Absolutely.”

Authorities say Murray gave Jackson a fatal dose of propofol. Murray has pleaded not guilty to involuntary manslaughter.

The witness, one of the experts who evaluated Murray’s actions for the California Medical Board, expressed dismay about the drugs Murray gave the pop star, his failure to immediately call 911 for help, and his lack of monitoring and record-keeping.