Police booked a 24-year-old Gonzales man on a count of vehicular homicide Saturday after a toxicology report revealed he was impaired at the time of a crash that killed a passenger in his car last May.

Jason L. Williams was driving his 2005 Suzuki Forenza on Airline Highway when his car ran off the roadway to the right, State Police said. His front seat passenger Dylan T. Martin, 21, also of Gonzales, was not wearing a seat belt and died after the crash, according to the initial State Police news release at the time of the crash.

Williams’ Suzuki hit a culvert and rolled several times before stopping on its roof, according to the release, and Martin was partially ejected from the car, causing fatal injuries.

Impairment was suspected after the initial investigation, but Williams was only accused of careless operation at the time. Toxicology reports can take anywhere from three months to a year to be completed, Lee said.

Williams was booked into Ascension Parish Jail on a count of vehicular homicide on Saturday, said Trooper First Class Bryan Lee, State Police spokesman.

Laurrie Perrilloux, Martin’s mother, said Martin and Williams were friends who had met on social media and that they had gone on a drive to listen to a CD.

“It happened right across the street from where we were living,” Perrilloux said Saturday. “Ambulances were passing and me never knowing that was my child lying in the ditch across the street.”

Perrilloux said she was relieved to hear that Williams had been arrested.

“I hope that young man doesn’t see the light of day for a long time,” Perrilloux said. “He knew from the beginning what he had in his system. He caused my son to lose his life.”

Martin, who lived with his parents, laid bricks with his stepfather for a living. He was the youngest of four sons, Perrilloux said.