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High school student fatally stabs classmate in the chest and back because she started dating her ex-boyfriend

Tanaya Lewis, 17, who stabbed 16-year-old Danyna Gibson was seen chasing the victim with a steak knife at Fitzgerald High School before stabbing her four times

A 17-year-old Detroit girl accused of killing a classmate in school was reportedly laughing as she chased her classmate with a steak knife before stabbing her in the chest and back, authorities said on Friday as they filed a first-degree murder charge.

Tanaya Lewis was arraigned in Warren District Court on Friday, two days after 16-year-old Danyna Gibson was murdered in a classroom at Fitzgerald High School. Police said there was animosity between the straight-A students over a boy.

The case is "very unfortunate, all the way around," defense attorney Mark Brown said after the hearing.