A 15-year-old boy has been arrested on a murder charge in the death of a toddler he was baby-sitting.

The 2-year-old was rushed to a hospital in cardiac arrest on Sept. 17. An autopsy showed Raheem Dixon died from a blow to the stomach, but police were still investigating the circumstances."We don't know how exactly the trauma was caused," Lt. Det. Paul Farrahar said Wednesday.

Akeem Jackson, a neighbor, was taking care of Raheem at the time.