New Delhi, Oct. 8 -- A teenager boy from Staten Island in New York State beheaded his mother's boyfriend in a chilling crime, and told his sister to "go to your room," when she returned home from school.

The incident was reported from a family home in West Brighton of Staten Island when the girl found the body of one sanitation worker - the 46-year-old boyfriend of her mother - in a bathtub, with the knife still stuck in his head.

The girl had just returned from school. Upon arriving, she spotted her blood-drenched brother who, after seeing her, told her, "I did something bad, go to your room," almost like a warning.

Ignoring the warnings, the girl followed the bloodstains across the floor and discovered her mother's boyfriend's body i...