The front door at 1433 Columbia Rd. NW remained broken this morning, but city leaders vowed that they would fix up the building.

The fatal shooting of 9-year-old Oscar Fuentes inside his Columbia Heights apartment on Saturday night was not gang-related, according to D.C. Police Chief Cathy Lanier. Lanier, along with D.C. Mayor Adrian Fenty and Ward 1 D.C. Council member Jim Graham, this morning announced the arrest of Josue Pena, 26, in the killing. Pena has been charged with first degree murder.

“There is no indication that this is gang related,” Lanier said, though she subsequently did acknowledge that the suspect is a known associate of MS-13.

The chief briefly outlined how the shooting occurred as the police now understand it. The suspect had attempted at least a couple of robberies in the nearby area prior to trying to rob members of the Fuentes family as they walked back to their apartment in the 1400 block of Columbia Rd. NW on Saturday night, Lanier said. Oscar’s aunts managed to make it inside the building and close the door of their apartment, but thanks to the front door of the building being broken, the suspect managed to follow them inside, and allegedly fired a shot through the apartment door, striking and killing Oscar.

Lanier declined to comment on any evidence that led to the arrest of Pena, but said he is known to police and has been known to frequent the area where the shooting took place. Pena was arrested at 5:50 a.m. this morning in Hyattsville, Md.

The city plans to begin work upgrading the safety of the apartment building, located at 1433 Columbia Rd. NW, and bill the landlord, Fenty said. Following the shooting, city inspectors discovered over 100 housing code violations, the worst of which were unsecured front and back doors and an unsecured roof door.

“This is a landlord who didn’t have enough concern for his tenants,” Fenty said, while acknowledging that buildings in similar condition are too commonplace inside the District.