SAN DIEGO — A man was killed Tuesday in a crash near Camp Pendleton involving a semi-truck, the California Highway Patrol said.

According to the CHP Traffic Incident Information Page, the crash happened shortly before noon on southbound Interstate 5, just south of the Aliso Creek Rest Area.

The driver of a white Infinity QX4 crashed into the back of a semi-truck “for reasons still under investigation,” CHP said in a news release.

The 54-year-old man driving the SUV died. Authorities identified him only as a Westminster, California resident.

Investigators do not believe alcohol or drugs contributed to the crash.

A Sig Alert was issued in the area until around 3 p.m.

This is the second deadly crash involving a semi-truck on southbound I-5 in as many days. On Monday, a woman was killed following a multi-vehicle collision in Encinitas.

The circumstances that led to the crash are still under investigation. The CHP incident page did not immediately clarify how many people were killed or injured in relation to this incident.