Officer Scott Williams Wounded In Navy Yard Shooting

DC Officer Scott Williams was identified in a Monday night press conference as one of those in the shooting at the Washington Navy Yard earlier in the day.

Thirteen people -- including the gunman -- were killed and multiple others injured when 34-year-old Aaron Alexis opened fire inside the Naval Sea Systems Command Headquarters building at about 8:20 a.m, according to police.

At a 10:15 p.m. press conference , DC Mayor Vincent Gray said he visited Officer Williams, who is "doing well" after being shot in the legs.

At the same press conference, Metropolitan Police Chief Cathy Lanier said that Williams was a "great police officer" with "a stellar record."

Lanier also indicated that Aaron Alexis was "the single and sole person responsible", dispelling rumors that a second suspect is still at large.

Monday night, officials also confirmed the names of 7 people who were killed in incident.