A 12 year old boy beat a toddler to death with a baseball bat. He got irritated with the toddler's cries that he beat her to it. The boy was trying to watch TV while babysitting. He confessed that he was at that time babysitting a 10 year old girl and a 17 month old girl. The boy was arrested and charged with first degree murder.
reference: http://edition.cnn.com/2008/CRIME/01/06/infant.killed.ap/index.html