SAN ANTONIO -

A man was found dead at a truck stop off Interstate 35 and O'Connor Road late Monday evening.

Witnesses reported seeing the man inside a black pick-up truck around 10 p.m. The truck was in a parking lot filled with tractor trailers.

Police arrived and found blood at the man's feet. Officers initially investigated the man's death as a homicide but later told KSAT-12 the cause of death was Cirrhosis of the Liver.

The man's name has not been released and he did not have an ID on him. Police believe he was in his 50s.