WASHINGTON — A 31-year-old man faces murder charges, but Fairfax County police say the victim has yet to be identified.

Charged with murder is Ubaldo Lopez Yanez of no fixed address.

Police say preliminary information indicates both men were homeless and using an unoccupied apartment in Annandale, Virginia.

The victim suffered trauma to the upper body, although the exact cause and manner of death will be determined by the Office of the Medical Examiner. Police say they were called to 4200 block of Wadsworth Court Thursday afternoon for a report of an unresponsive man.

Anyone with information may call Fairfax County Police at 703-691-2131 or contact Crime Solvers by phone at 1-866-411-TIPS/8477. You can email in through www.fairfaxcrimesolvers.org or text “TIP187” to CRIMES/274637