GREENSBORO, N.C. — Three people were killed, including 10- and 2-year-old girls, according to Greensboro police. Brittany Christina McKinney, 28, is charged with three counts of first-degree murder. The victims were identified as Mkenzie Denise McKinney, 10, Serenity Taliem Rose, 2, and Jerry Griffin, 61. At 11:14 a.m. Wednesday, police responded for a welfare check on the 3600 block of Sweet Birch Drive. When they got to the scene, they say they witnessed an aggravated assault. At about 2:20 p.m., police said they had begun investigating the case as a homicide.