Alexandria police have arrested a second suspect in the slaying of a man whose body was found in a popular park in December.
Boris Rosa Castro, 19, of Fairfax, is charged with murder. He is being held without bond.
Castro had been wanted in connection with the homicide of 22-year-old Eduardo David Chandias Almendarez, who was found dead in Four Mile Run Park on Dec. 4, 2015.
Almendarez had been stabbed multiple times.
On Tuesday, an off-duty Fairfax City police officer saw Castro while driving to work and remembered that he was wanted in connection with the case, police said. He then contacted on-duty officers, who responded and detained Castro, Alexandria police said.
"This is a great example that officers such as this one are never truly 'off-duty' and continue to look out for the communities in which they work," Alexandria Police Chief Earl Cook said in a release.
Cook thanked Fairfax City Police for helping to apprehend Castro.
Police did not specify how they had identified Castro as a suspect.
The victim had last been seen in the park several days before he was found dead. Police previously said Almendarez had "been a victim of a crime and may be endangered."
Castro is the second person to be arrested in Almendarez' death. In January, police announced they'd arrested Edwin Alexander Guerreo Umana, 18, of Arlington. Umana was charged with murder.
Police are asking anyone with information about the case to call Det. William Oakley at 703-746-6606.