LAGUNA HILLS – A doctor and a physician’s assistant were arrested earlier this week after deputies found them having sex and using cocaine in a Mercedes parked near Saddleback Memorial Medical Center, police said Friday.

Alan O. Marcus, 61, and Amanda J. Aguirre, 29, were arrested on suspicion of being under the influence of a controlled substance and possession of a controlled substance, Orange County Sheriff’s Lt. Steve Doan said.

Security officers patrolling the parking structure adjacent to Saddleback in the 23900 block of Calle de la Magdalena saw two people sitting in a parked Mercedes on the sixth floor of the structure around 2 p.m. Tuesday.

When security officers came to inspect the vehicle again at 8 p.m., the two people were still inside and did not respond when an officer asked if everything was OK, Doan said.

The security guards called sheriff’s deputies, who found the couple “having sex and doing large amounts of cocaine while inside the vehicle,” Doan said.

Doan said Aguirre – 5 feet 1 inch tall, 105 pounds with blond hair and green eyes, according to arrest records – and Marcus – 5 feet 11 inches tall, 190 pounds with brown hair and brown eyes – work together in nearby medical offices.

A Dr. Alan Marcus is listed as practicing internal medicine and endocrinology at South Orange County Endocrinology in Laguna Hills. A message left with the office was not immediately returned.

Aguirre and Marcus were released on Wednesday on their own recognizance, according to sheriff’s department records.

Contact the writer: 949-454-7363 or cwebb@ocregister.com