A 7-year-old boy is dead, and his mother claims she's the one who killed him.Police say 40-year-old Tenika Revell has been charged with second-degree murder, masnlaughter and endangering the welfare of a child. They say Revell called them late Friday night, saying she had taken some pills after murdering her son, Bernard Revell. Police found the child dead in his bed, with severe trauma to the head.