An investigation is underway after a man was found dead on Interstate 65 in Birmingham Monday morning.

The discovery was made shortly after 9 a.m. on I-65 southbound just past the Green Springs Avenue exit. Initially Homewood police received the call but it was then turned over to Birmingham.

Authorities said a friend of the man's family recognized the vehicle and called 911. He was found slumped over in the dark SUV and pronounced dead on the scene.

The death is unclassified at this point but there was no obvious sign of foul play. Birmingham detectives and evidence technicians are on the scene.

The vehicle had been parked there for at least a day. Authorities said they are looking into the possible that the death is a drug overdose.