The victim has been identified as James Lee Dempsey, 51, of Hemet.
Police responded to a suspicious circumstances call on the 3100 block of Cajon Boulevard around 7:45 p.m., and found Dempsey suffering from trauma to his upper body.
Dempsey was pronounced dead at the scene by paramedics.
The case was being investigated as a suspicious death.
Anyone with information was urged to contact the San Bernardino Police Department at (909) 384-5656.