Around 1:15 pm on Thursday, officers were called to an area under an overpass that carries Herndon Avenue over the railroad tracks just east of Polk Avenue
When they arrived, they found the victim, 55-year-old Timothy Johnson, suffering from a gunshot wound to his chest inside a tent near the railroad tracks.
Paramedics tried to save him, but he was pronounced dead at the scene.
Authorities say Johnson was homeless and had lived in the area for several years.
Detectives are now searching for the suspect who shot him. Anyone with information on the case is asked to call the Fresno Police Department.