Police have not released any details about what led them to Guzman and what might have led to the shooting, but more information is expected to be available later today.
Barrow, 46, was attacked on Dec. 16, just after opening for business. He suffered a gunshot wound to the head and his body was found by a customer later that morning.
Police claim Guzman confessed to shooting Barrow and killing a second man a month earlier.
Henry Ray, 64, was shot to death at his Miami home after getting into an argument with Guzman. Guzman shot the man several times before firing a final shot to Ray's head.
Guzman is being held without bond.