Fourteen-year-old Jonathan Aguiluc of White Oak, Md. was assigned to babysit his little sister while his mother went to work her night shift. When Yanes returned home after her shift, she tried to feed her daughter but was unable to wake her up. The child was taken to the hospital, where she was pronounced dead, NBC Washington reported.
The boy confessed to beating his sister when he was taken into police custody. When she didn't stop stop crying, he covered her mouth and nose with his hands until she stopped crying and put the infant in her car seat. Police are calling this a premeditated crime.
Aguiluc is being charged as an adult with first-degree murder and is being held without bond. According to Maryland laws, children are allowed to babysit at age 12.