Emotionally disturbed teen stabs older sister to death at their Brooklyn home

An emotionally disturbed teen stabbed his older sister to death at their home in Brooklyn, police said Monday.

Cops raced to the home on Beverley Road near E. 48th St. in East Flatbush after getting a 911 call 11:29 p.m. on Sunday about an assault. They found Shanelle Colquhoun stabbed in the neck and arms.

Medics rushed Colquhoun, 26, to Kings County Hospital, but she could not be saved.

Her 17-year-old brother was taken into custody and was being questioned by detectives at the 67th Precinct stationhouse. A police source said he had been having emotional problems.

Charges against the teen were pending, police said.

Before the murder, police sources said, the teen assaulted his mother, who called 911. But the teen left before police got there.

Officers filed a report and left, as did the mother, who went shopping only to get a frantic call from her daughter.

“He’s back!” the daughter told her mother, sources said. “He’s back!”

The teen then allegedly killed his sister, who neighbors said used a wheelchair.

“All the time he’s fighting with his mom, so that’s why the police come every two or three days,” said neighbor Hossain Arif, 23.

“I think he’s mentally sick,” Arif said of the teen.