A man died under a highway overpass in Mission Hills Tuesday, according to CHP and San Diego Police officers.
The San Diego County Medical Examiner was called to the area under the highway near northbound Interstate 5 and West Washington Street after 5 a.m.
A man living in a hole in a freeway bridge told police officers his friend began having trouble breathing so he left to get help.
When he came back, the man was dead, the friend told police.
The medical examiner's office will determine the cause of death.