A blood-drenched Staten Island teen who allegedly decapitated his mom’s boyfriend with a knife chillingly told his younger sister, “I did something bad, go to your room,” when she returned home from school, sources revealed Tuesday.
The 19-year-old’s unsettling warning to his sister went unheeded, as she followed blood trails to their West Brighton home’s bathroom and found the 45-year-old city sanitation worker’s body in the tub – with a knife still in his severed head Monday afternoon, sources told The Post.
The grisly discovery prompted the girl, 16, to call her mother, who evidently rushed to the Cary Avenue house as NYPD cops grappled with the scene, neighbors and sources said.
“The mom, she just kept saying to her son, ‘Why would you kill him?! I still loved him!’ She was yelling, screaming from outside into the house. Where her son was,” said neighbor Jennifer Diaz, 46…