BOISE, Idaho (AP) — A California man who went missing while traveling from his summer job in Idaho to the University of Montana died in a car crash northeast of Boise.

Custer County Coroner Vicki Armbruster says 21-year-old Lucius Robbi of Orleans, California, died on Aug. 19 of blunt force trauma that happened when his car went off Highway 21 and down a 60-foot embankment.

A private helicopter hired to join the widespread search for Robbi spotted the tip of a kayak in the trees near the Stanley Lake turnoff on Thursday.

Robbi left Horseshoe Bend on Aug. 19 to travel to Missoula, Montana, to attend classes at UM. He was reported missing when he didn't arrive for orientation on Aug. 20.

The Idaho State Police is investigating the cause of the crash.