A Vallejo man has been charged with two counts of murder in the weekend fatal shootings of two teenagers on a Napa residential street. 22-year-old Jonathan Richard Wesley Nicholas Jr. made his first appearance in Napa County Superior Court in Napa on Wednesday. Nicholas is accused of killing the two young women, one who was a mother. The victims have been identified as 19-year-old Aileen Villasenor and 17-year-old Sasha Mufich. Nicholas is scheduled his return to court on May 7th, when he will enter a plea. He remains jailed without bail.