Law enforcement was called out about 2:15 p.m. on reports of a death at the Harvest Market Thriftway store on North Broadway. A short time later, someone called to say that a man had stabbed an employee and that others were holding the man down.
At about 2:30 p.m., the sheriff's office received reports that a woman was found dead at a home on Elwood Road in Colton.
The suspect was taken into custody at the scene and transported to a nearby hospital for an evaluation.
Investigators said they will release the names of those involved as the case develops.