Christopher Maher, Jim Wells County Correspondent

SAN DIEGO - A father and son from Aransas Pass were killed Monday when the truck they were riding in was struck head-on by an 18-wheeler on Highway 359 just south of San Diego.

The accident occurred on Highway 359, one mile south of San Diego, shortly after 3 p.m. Monday.

Sgt. Ricardo Palacios, with the Department of Public Safety, said two 18-wheelers were traveling southbound on Highway 359 headed toward the Martin Marietta Materials location.

As the first 18-wheeler slowed to make a right turn into the location, the driver of the second 18-wheeler failed to brake in time and was forced to swerve to the left, striking the rear left side of the lead 18-wheeler's trailer, Palacios said.

After striking the trailer, the second 18-wheeler then veered into the northbound lane, where it collided with a northbound pickup truck.

The pickup truck was thrown upside down into a ditch on the east side of the roadway and burst into flames, Palacios said.

Two men in the pickup truck, later identified by Palacios as Joe Hunsucker, 55, and his son, Josh Hunsucker, 22, both of Aransas Pass, were killed on impact.

The driver of the second 18-wheeler, which had signs on its doors linking it to a Premont company, was transported to CHRISTUS Spohn Hospital with non-life threatening injuries.

His name has not yet been released by authorities.

The driver of the first 18-wheeler was not injured in the accident.

Highway 359 was closed between Benavides and San Diego for more than four hours as crews with the Alice Fire Department and the San Diego Volunteer Fire Department worked to clear the scene.

No citations were issued in the accident Monday, but Palacios said the accident is still under investigation.