A 35-year-old man died aboard a TriMet bus in North Portland Monday night, authorities said.

The victim had been traveling on an eastbound No. 75 bus along North Lombard Street around 7:45 p.m. when he suddenly stopped breathing near Interstate Avenue, said Lt. Rich Chatman, a Portland Fire and Rescue spokesman.

Several passengers tried to revive the man while another called 911, Chatman said.

Authorities rushed to the scene, but could not save the victim, police said.

The victim’s name was not immediately released.

Based on a preliminary investigation, the man's death does not appear suspicious, said Sgt. Pete Simpson, a Portland Police Bureau spokesman.

The Oregon State Medical Examiner will perform an autopsy tomorrow to determine the cause of death, Simpson.

The investigation is ongoing.

-- Shane Dixon Kavanaugh