The 17-year-old shot on Halloween night in Georgetown has died, police said Tuesday.

Tyronn Vincent Garner of Southeast Washington was pronounced dead shortly after 8 p.m. Monday, D.C. police said. He had been shot in the head a week earlier in the 2800 block of M Street NW about 11 p.m.

The Georgetown shooting was one of at least five incidents of gunfire across the city on Halloween, which prompted Police Chief Cathy L. Lanier and Mayor Vincent C. Gray (D) to hold a news conference to address the violence.

Police arrested a man who witnesses said fled the scene after Garner’s shooting. Andre Coleman, 24, of the 4300 block of Gorman Terrace SE was charged with carrying a pistol without a license.

Nobody has been charged with killing Garner, and the case remains under investigation, D.C. police spokeswoman Gwendolyn Crump said. According to court papers filed in Coleman’s case, police chased Coleman and another man the night of the shooting, but the other man got away. Information about the second man was not available Tuesday.

At one time, Garner was supposed to be living outside the District long before Oct. 31. A ward of the city’s Department of the Youth Rehabilitation Services at the time of his death, sources said, the agency said in July it would send Garner to a juvenile facility in Pennsylvania with more services than it could offer. Until he was placed there, he was to stay at New Beginnings, a 60-bed secure juvenile facility in Maryland.

But he was never transferred, sources said. At a September hearing, according to sources, the agency told D.C. Superior Court Judge Milton Lee that it would keep Garner at New Beginnings but did not explain why.

Upset that the agency did not move Garner as planned, sources said, Lee placed him on probation as of Sept. 30, giving him a 7 p.m. curfew. Another hearing on Garner’s case was set for Nov. 4.

Council member Jim Graham (D-Ward 1) said Tuesday that he had requested Garner’s files. “We need to have some explanation as to how and why his commitment was revoked, resulting in him not being in a secure facility,” he said.

Chris Shorter, chief of staff for the youth agency, and D.C. Superior Court spokeswoman Leah Gurowitz said they could not comment on a juvenile case.