LOS ANGELES (AP) — Authorities say the 22-year-old driver of a car that struck and Christopher Caldwellkilled four college students on a coastal highway in Malibu is being held on $8 million bail.

The man was arrested in the investigation Tuesday and is due in court Wednesday, said the Los Angeles County Sheriff’s Department. The man was arrested immediately after the Oct. 17 crash but released a day later while investigators gathered evidence, the sheriff’s department said in a statement.

“The Sheriff’s Department is relentlessly working to ensure we get justice for the victims’ families,” the statement said.

The case has been referred to the district attorney’s office, the statement said. It was not immediately known if the man had an attorney.

The Pepperdine University students were walking along the scenic Pacific Coast Highway at 8:30 p.m. when the driver of a BMW lost control and sideswiped at least three parked vehicles before crashing into them and hitting two others, authorities have said. The four women were pronounced dead and the two others were taken to a hospital with injuries.

The school later identified those killed as Niamh Rolston, Peyton Stewart, Asha Weir and Deslyn Williams, all seniors.