A St. Louis woman and her boyfriend were taken into custody today after her six-year-old daughter was fatally shot in the head by another child, police say.The little girl, Mi'Kenzie Bostic, was already dead when police arrived shortly at 1:30 a.m., authorities say. The 27-year-old mother and 31-year-old boyfriend told investigators they were asleep when she was shot, police say.
Three other kids — ages 9, 4 and 3 — were also in the home in the 6300 block of Minnie Avenue on the edge of the Walnut Park West neighborhood in northwest St. Louis.…