A pedestrian was critically injured Monday night when she was struck by a Jeep driven by a 28-year-old man on Route 25 in Coram, police said.

The victim, identified by Suffolk County police as Susan Restrepo, 56, of Coram, was transported by Coram Fire Department Rescue to Stony Brook University Hospital, where she was in critical condition.

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Police said the driver of the 1994 Jeep that struck her was not injured.

That driver, identified as Justin Vaughan of Port Jefferson Station, told police he was headed westbound on Middle Country Road, Route 25, when a vehicle with no headlights crossed in front of him -- causing him to swerve "to avoid a collision," police said. Vaughan then hit Restrepo, police said.

The accident occurred west of Homestead Drive at 8:21 p.m. The other vehicle was not located -- and police are asking anyone with information regarding the crash to call Sixth Squad detectives at 631-854-8652.

Police said the Jeep was impounded for a safety check.

Vaughan was not charged.