OSAKA -- A man was found strangled in a parked car with another dead man nearby on a pier Thursday morning in Izumisano, Osaka Prefecture, according to local police.

The driver's license found on the strangled man identified him as Masaaki Nagae, a 50-year-old doctor from the town of Kibi, Wakayama Prefecture. He was found in the passenger seat with an electrical cord that was wrapped around his neck and tied to a handle above the door, police said.

Investigators were still trying to identify the other man, who looks to be around 20, and police suspect it may be Nagae's son, sources said.

According to investigators, the doctor's T-shirt was stained with what appeared to be blood, but there was no visible sign of any bodily injury.

An iron pipe and hammer stained with blood were also found in his car, police said.

The youth was found lying beside the car. His face appeared to have been battered with a blunt instrument and newspapers were placed over his head, police said.

Investigators said they suspect Nagae committed suicide after killing his son. The bodies were found by a passerby at around 6:30 a.m., and police were notified immediately.