Fairfax County police charged Santos Narcisco Osorio, 34, of Falls Church, for the murder of 23-year-old Edgar Armando Serrano, of Annandale. Detectives on the case determined the victim and suspect were at a party in the 7700 block of Camp Alger Avenue in Falls Church when, at around 4 a.m. on Christmas morning, a fight started between them.

According to a police report, Serrano fled the party on foot. Osorio chased Serrano down in the 7600 block of Trail Run Road, assaulted him again and then fled the scene.

The Serrano’s injuries appear to have been caused by a sharp instrument. The exact cause and manner of death will be determined by the Fairfax County Police Department’s Office of the Chief Medical Examiner.

Detectives from the Homicide and Crime Scene Sections worked quickly to identify possible suspects. At around 4 p.m. on Christmas Day, Osorio was located at his home and taken into custody. He was transported to the Fairfax County Adult Detention Center and charged with homicide.