Police said Marshall Stephens Sr. is charged with murder in the Arlington slaying.
Dean, hired in 2015, took over a department marred by high-profile failures.
The incident happened on Three Oaks Drive, police said.
The shooting Wednesday of Deon Kay has angered his family and prompted demonstrations.
Brennen Sermon was charged with assault after allegedly punching the officer in the face.
Community members pressed for details about the shooting of 18-year-old Deon Kay.
Elected officials in Montgomery County, Md., which initially responded, have called for a hearing on the county’s response.
Incidents reported by police in Annapolis and Anne Arundel and Howard counties.
A listing of incidents reported by police in Prince William County, Manassas and Manassas Park.
Reports from the state police and the Calvert, Charles and St. Mary’s sheriff’s offices.
The crash happened along Indian Head Highway in the Fort Washington area.
No injury was reported in the shooting incident, police say.
The arrests followed a car crash, county police say.
Police say both the victim and the man arrested are from Richmond.
The police and the U.S. attorney’s office are clashing over demonstration arrests.
Davon McNeal died after men opened fire in the street.
A man was in distress and taken into custody.
A Palmer Park man was charged in the July 18 fatal shooting.
The incident happened along James Monroe Highway in the Lucketts area.
D.C. police said the man’s injuries were not life threatening, and a person was in custody.
