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SAN MARCOS — A man died in San Marcos Monday when his SUV veered off State Route 78 and flipped in front of a business.

California Highway Patrol said the driver of a silver 2000 Mercedes-Benz ML320 tried to make an abrupt lane change on 78 eastbound near Twin Oaks Valley Road when he lost control of the SUV.

“For reasons that are still under investigation, the driver loses control of his vehicle and drifts over to the right shoulder, comes off the freeway onto Industrial and overturns,” a CHP spokesperson said.

The Mercedes crashed through a chain-link fence near Industrial and East Carmel Street before flipping. SkyFOX showed the SUV on its side in the parking lot of Sid’s Carpet Barn.

Officers said it’s too early to say what caused the crash. The victim, a 69-year-old man from Vista, died at the scene. His name has not been released.

Anyone with information was asked to contact the CHP Oceanside office at 760-643-3400.

Officers were investigating a second deadly crash on SR-78 late Sunday night. CHP said a 2009 Toyota Tacoma pickup truck traveling east on the westbound side of 78 collided head-on with a Toyota Matrix hatchback near Sycamore Avenue in Vista.

The driver of the Matrix, a 24-year-old Vista woman who has yet to be identified, died from her injuries, authorities said. Investigators suspect the other driver, a 36-year-old Carlsbad man, was intoxicated at the time of the crash. His identity was not immediately available.