DALE CITY, Va. -- A pregnant 17-year-old high school student was beaten to death with a baseball bat in Prince William County, Va., police said.

Cheri Washington died Friday after being beaten while visiting a home in Dale City. Washington was a student at Hylton High School.

Police said Carlos Diangilo Williams is in their custody. They said he had a relationship with Washington.

Dennis Mangan, of Prince William County police, said the two had an argument that escalated into a beating. Mangan said Williams used a bat and his hands and feet to beat Washington.

Washington managed to flee the home, Mangan said. A neighbor then saw her and drove her home, where her mother called for an ambulance.

Williams has been charged with malicious wounding, and police said more charges are pending.

Police have not said what may have led to the fatal beating.