Visalia police say they were called to the Walmart Neighborhood Market near Demaree Street and Houston Avenue just after 10:00 p.m. regarding a reported fight.
When they arrived, they found a man unconscious.
He was taken to Kaweah Health with a severe head injury.
The Visalia police Violent Crimes Unit is investigating the incident.
Anyone with information is asked to contact the Visalia Police Department.