SAN FRANCISCO (KRON) — A missing 21-year-old University of San Francisco student, Christopher Liang, was found dead in Fresno County.

Liang was reported missing on Feb. 28 after he went on a road trip from San Francisco to Irvine, according to his brother.

The college student was driving a rented Tesla, which was last located at a charging station in Firebaugh off Interstate-5.

For unknown reasons, the Tesla crashed over a cliff in Fresno County.

“Pending anything new in the toxicology, it would appear the car crashing off a cliff caused his death,” said Tony Botti of the Fresno County Sheriff’s Office.

Liang’s brother was concerned about the road trip because it was his first time driving since he got a driver’s license in March. His brother also said Liang suffered from “mental health issues.”