The trial for the father and son charged in the murder of Cal Poly student Kristin Smart will begin April 25, 2022, a judge announced Wednesday morning.Prosecutors in San Luis Obispo charged Paul Flores with murder in the 1996 disappearance of Smart. His father, Ruben, is accused of being an accomplice for allegedly helping bury her body.The men pleaded not guilty Wednesday morning.Paul Flores was the last person seen with a very intoxicated Smart on May 25, 1996, as he helped walk her to her dorm at Cal Poly after a party, witnesses said. Prosecutors said he killed Smart while trying to rape her in his dorm room.KSBY contributed to this report.