VALLEJO (CBS SF) — The death of a man whose body was found off of Interstate Highway 80 in Vallejo Sunday morning is considered suspicious, a police lieutenant said.

The man, a 48-year-old Vallejo resident, was found on the shoulder of a westbound Highway 80 off-ramp near Interstate Highway 780, Vallejo police Lt. Kevin Bartlett said.

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A passerby who discovered the man’s body reported it to the California Highway Patrol around 7 a.m. and Vallejo police also responded to the scene, Bartlett said.

It appears the man died sometime during the night, according to Bartlett.

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Investigators are working to determine the circumstances surrounding the death, he said.

The man’s name has not been released pending notification of his next of kin, according to Bartlett.

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