The victim, later identified by the Santa Clara County medical examiner's office as Leonard Lawrence Acosta, a 58-year-old San Jose resident, was the sole occupant of the truck that police found tipped over on its side shortly after 5 a.m. on the 4200 block of Middlefield, just south of San Antonio Road near the Mountain View border.
Fire Department personnel pronounced the driver dead at the scene, according to the police.
No other vehicles were involved and no other people injured. Police have not determined if drugs or alcohol or a factor in this accident.
The block of Middlefield was closed to traffic Saturday morning as officers from the Palo Alto Police Department's Specialized Traffic Accident Reconstruction team investigated the cause of the accident. All lanes were re-opened as of 1:30 p.m., police said.
Anyone who witnessed the accident is asked to call the department's dispatch center at 650-329-2413. Anonymous tips can be emailed to firstname.lastname@example.org or sent by text or voice mail to 650-383-8984.