The driver killed in a multi-car collision near Potter Valley Sunday was identified Monday as Robert Garrison of Newcastle.

Garrison, 55, had been driving a van full of Boy Scouts Sunday morning, headed to a week-long camp near Willits.

He died in the collision. Three of the five Boy Scouts with him suffered major injuries, including Garrison's 14-year-old son.

Ukiah CHP Officer Patty Benedetti Monday morning said the latest information indicated the three, ages 14-18, still were hospitalized.

The crash remained under investigation Monday, Benedetti said.

But the initial reports laid out the crash progression, which resulted in Garrison's Honda Odyssey van pushed into a head-on collision with another vehicle as he drove west on rural Highway 20, west of Potter Valley.

Five vehicles were involved in the 11:10 a.m. crash.

It started with a pickup driver trying to make a left turn from Highway 20 into a driveway

The truck was driven by off-duty Mendocino County sheriff's Capt. Randy Johnson, who was pulling a trailer.

Another driver in a 2011 Toyota Sequoia had stopped behind Johnson, waiting for him to turn when a 2006 Ford F-250 came up behind them.

That truck, driven by Eugene E. Galletti, 73, of Redwood Valley, hit the Sequoia, which then hit the trailer.

Galletti's truck then moved into the path of Garrison's van.

As those two vehicles collided and spun out of control, the van was then hit by a 2005 Dodge pickup, pulling a trailer.

The other adults in the five vehicles either had minor or no injuries, according to the CHP.

A 17-year-old Newcastle teen with critical injuries was taken to Santa Rosa Memorial Hospital.

The driver's son was taken to Ukiah Valley Medical Center then transferred to Oakland Children's Hospital, the CHP indicated.

And Anthony Marlatte, 18, of Auburn was sent to Ukiah Valley Medical Center with major injuries.

Two other teens in the car had minor or no injuries.

The crash closed the two-lane highway for about three hours.