16-year old Lamana McKoy of Geneva is the teenager police believe is responsible for the deaths of 14-year old Ashley Vincent and 18-year old Monique McKoy.An Ontario County grand jury met behind closed doors all day Tuesday considering evidence in the case. Formal charges could come Wednesday.Lamana McKoy is Monique’s cousin. It’s been reported both girls were sexually assualted. Monique McKoy’s body was discovered after a fire at a downtown Geneva apartment last January. Ashley Vincent disappeared in late December, her body was found in March behind a dumpster near her Patterson Avenue home.Lamana’s mother testified before the grand jury, and then told reporters outside the Canandaigua Courthouse that her son could not have committed the murders.Sources tell the Finger Lakes News Network that investigators have DNA evidence that connects Lamana McKoy to the murders. Other physical evidence found when Ashley Vincent’s body was discovered also links the boy to the murder.Lamana McKoy had been held at the Kid’s Peace Children’s Facilty in Romulus, but was moved to a more secure facility in Monroe County when he was charged with other felony charges two weeks ago.