NTSB Probable Cause

THE FAILURE OF THE PILOTS OF BOTH AIRPLANES TO SEE AND AVOID EACH OTHER. CONTRIBUTING TO THE ACCIDENT WAS THE FAILURE OF THE SACRAMENTO CONTROLLER TO ADVISE THE STOCKTON CONTROLLER OF THE IMPENDING UNSAFE SITUATION, AND THE FAILURE OF THE STOCKTON CONTROLLER TO ISSUE A TRAFFIC ADVISORY AND A SAFETY ALERT TO THE PILOT OF THE C-180, N3313D.