Police are trying to find how a man who was found injured on the side of a road on Houston's south side later died at a hospital.

Homicide investigators from the Houston Police Department went door to door Wednesday morning asking if anyone in the neighborhood near Lyndhurst and Sharondale knew who killed a 53-year-old man. Witnesses say a walker was found not far away from the man.

Police say someone stopped by Fire Station 35 at around 10:45 p.m. Wednesday and sent help to the man spotted beside the road. Houston police say the person who stopped said the victim might have been involved in an accident.

Paramedics found the man was unresponsive with a wound under his arm. Firefighters rushed him to the hospital, but he died. Police said it appeared the man had been shot.

Sgt. Thomas Simmons of the Houston Police Department said, "As far as we know, the HFD arrived and found the male sitting on the side of the road. And had unknown injuries. Been told there were gunshot wounds. At this time, we're not sure of the exact injuries."

Police say they found no shell casings Tuesday night. Police believed the victim might have been homeless or from a halfway house not far away. His name has not been released.

Anyone with information in this case is urged to contact the HPD Homicide Division at 713-308-3600.