It was a once a couple who were going to go to the U.S.A for a seminar.

They could not take their little girl with them and so,they hired a baby sitter.   

She sat down comfortadlyin the living room to watch  a thriller on TV.

Suddently there were screamsfrom the baby. She went to the bed room and she saw

the murderer holdinging a knife. When the parents returned , they saw tha baby sitter

and the murderer hanging from the ceiling

WHO IS THE KILLER???