Johnathan Maloney, 45, his wife Susan Maloney, 42, and their young children, Grace and Aiden, all died in the impact when a young driver speeding on the highway smashed into their mini-van, said the CHP.

The 19-year-old driver of the Mini Cooper that caused the crash was Steven Culbertson of Lakeport. The CHP had been notified Sunday morning that Culbertson was considered brain dead and on life support. He was being treated at Santa Rosa Memorial Hospital.

The crash was at the intersection of Highway 37 and Lakeville Highway at 9:20 p.m.

Four cars and 10 people were involved, according to the CHP.

CHP crash investigators were on the scene all night and had the highway closed from about 10:30 p.m. until 7:30 a.m., said Sgt. Kevin Mensior.

“We were diagraming the entire thing,” said Mensior, who helped with the crash investigation.

Witnesses estimated Culbertson was driving between 70-90 mph when he clipped the rear end of one car then ran a red light and hit the Maloney’s Nissan Quest.

Culbertson was speeding south on Lakeville Highway when he hit the back of a southbound 2004 Honda CRV, driven by Thomas Graham, 61, of Petaluma.

Culbertson then continued south through a red light at the intersection and hit the Maloney’s mini van, which was headed east on Highway 37.

The mini van was pushed into a 2002 Mitsubishi Galant, which also was eastbound on Highway 37. The Galant was driven by Carrie Rodriguez, 52, of Novato.

Driver Graham and passenger James Parker of Stockton weren’t injured. Rodriguez and passengers Liberty Rosario, 47, of Fairfield and Adelaida Nicholas, 53, of Novato were taken by ambulance to area hospitals, treated for minor injuries and released, the CHP said.

Culbertson was taken by Reach medical helicopter to the Santa Rosa hospital, considered to be in grave condition.

“There was no evidence of alcohol or drugs,” said CHP Sgt. Trent Cross. But a blood sample was taken from Culbertson and will be analyzed, he said.

Heavy holiday weekend traffic was diverted at multiple places to get around the crash and closed highway.

Speed was being considered as a factor in the crash and alcohol use hadn’t been ruled out, according to a CHP press release.

Firefighters from Lakeville, Wilmar, Novato and Petaluma were called to the crash.