The body of Richard Hernandez Cruz, 16, was found in a grave in a Fairfax County park.
Jonathan Fahey of Falls Church said he would focus on gang violence and the opioid crisis.
Such cases have been hotly contested in the courts in recent years.
A roundup of news from across the region.
Jonathan Fahey, who spent 17 years as an assistant U.S. attorney in Virginia, will make his announcement Tuesday.
Fairfax County prosecutors said Laszlo Pentek staged an elaborate coverup of his crime.
After three hours, the building was cleared, and authorities said there was no evidence a crime occurred.
A Fairfax County case shines light on the murky world of drug stings and police seizures.
Kofi Annan said the spat reveals a generational divide in the civil rights organization over how to approach policing issues.
