SAN ANTONIO -

Police are trying to figure out who beat a man and left him in the middle of a downtown street.

A witness found the man in the 100 block of E. Houston St.

Police say he had been beaten and had head injuries and a large laceration on his head.

They say the man wasn't responsive when EMS transported him to SAMMC.

Police say they found a knife next to the victim, but it had no visible signs of blood on it.