Police say officers were called to Fallen Heroes Park, located on East Chase Avenue and South Plano Street, just before 11:20 a.m. Saturday.
When officers arrived, they found the man suffering from multiple stab wounds.
Officers provided medical attention and he was taken to the hospital, where he later died.
Investigators learned the victim had gotten into a fight with an unidentified man before the stabbing.
Anyone with information on this stabbing is urged to contact the Porterville Police Department.
Stay with ABC30 for the latest details on this developing story.