Margaret Henry arrested for allegedly striking and critically injuring woman in driveway.

A northern Virginia woman is being held without bond, accused of running down her ex-husband's fiancée as the couple stood in a Lorton driveway, seriously injuring the woman.

Margaret Henry, 48, drove a car off Belmont Boulevard, through the yard and struck the victim, investigators said. According to search warrant documents, the car then hit a utility trailer before stopping in the yard. The driver's ex-husband restrained her until police arrived, according to the search warrant.

Emergency crews found the victim "entangled in the windshield of 2013 Hyundai." She was transported to Inova Fairfax Hospital with leg fractures that were so severe her lower leg had to be amputated. Police investigators used the search warrant to get blood and other samples from the wrecked Hyundai.

Before Henry and her husband divorced a few years ago, the couple had loud arguments, neighbors said.