SAN DIEGO -- A teenage boy was fatally injured Wednesday when the bicycle he was riding crashed into a parked landscaping truck near his Carmel Valley home.

Nigel Clarke, 15, was heading to the north on Carmel Country Road about 8:40 a.m. when he rounded a curve at high speed and crashed into the unoccupied vehicle near State Route 56, according to San Diego police and the county medical examiner's office.

Though he was wearing a helmet, the teen suffered severe head injuries and was pronounced dead at Scripps Memorial Hospital La Jolla about 30 minutes later, authorities said.