Two people were fatally shot in Southeast D.C. late Saturday night and early Sunday morning, in what authorities said appeared to be unrelated incidents.

The first incident occurred about 9 p.m. Saturday in the 1200 block of Trenton Place SE, police said. Police said 19-year-old Antwan Lamont Petty was fatally shot. They did not release information about suspects or a motive in the case.

The second incident occurred about 1 a.m. Sunday in the 1100 block of Chicago Street SE, police said. Police said 32-year-old Henry Charles Miller, of Southeast D.C., was fatally shot, and 48-year-old David Allen Shepherd, of Northeast D.C., had been charged with murder in his slaying.

It remains unclear what relationship, if any, Shepherd had to Miller. Police said that Shepherd was arrested in the 1400 block of Brentwood Parkway NE soon after the shooting, when police broadcast a description of the suspect and officers spotted and pursued him.

Gwendolyn Crump, a D.C. police spokesman, said the shootings do not appear to be connected. She said homicide detectives do not have a suspect or motive in the 19-year-old's slaying, and they believe the other slaying stemmed from an argument between the two men.