UPDATE: A Coroner's Department official identified the victim as Jie Fang, 27, of Chino Hills. Fang had a plastic bag over his head, and a relative discovered his body in a rear room of the office, the official confirmed.
"We're looking at it as a suicide vs. accident. It appears he was probably inhaling nitrous oxide. It could have been accidental, it could have been suicide. We don't know yet," Larry Dietz of the Coroner's Office said.
Dietz had no other information. It is unknown whether Fang was an employee or patient of the dental office.
An autopsy is pending to determine the cause of death.
Original Story: Arcadia police are still on scene investigating a possible suicide that took place at a dental office in the 60 block of North First Avenue.
According to scanner reports, the victim had a plastic bag over his head when someone at the dental office discovered him at 11:39 a.m. and called 9-1-1. The report indicated the caller attempted CPR on the victim.
Scanner reports are preliminary; police have not confirmed any details of the incident, including who discovered the man or how he died.
"We're just doing a death investigation. We haven't been able to confirm if it's a suicide or not," Lt. Colleen Flores said.
The victim had no pulse and had stopped breathing by the time officers arrived, according to scanner reports. Officers were still on scene as of 2:50 p.m.
Los Angeles County Coroner's officials did not remove the body until mid-afternoon, as their resources were occupied by another incident elsewhere, Flores said.