Tanaya Lewis (l.) is charged with killing classmate Danyna Gibson Wednesday at Fitzgerald High School in Warren, Michigan.  (Warren Police Department/GoFundMe)

A Michigan teen accused of fatally stabbing a classmate was “smiling and laughing” during the attack, according to reports.

Two dozen students watched in horror as Tanaya Lewis, 17, killed Danyna Gibson, 16, with a kitchen knife in a classroom Wednesday at Fitzgerald High School in Warren, Mich., Fox 2 Detroit reported Friday.

“Witnesses said the defendant was smiling and laughing as she was chasing the victim,” Detective Donald Seidel of the Warren Police Department told a judge Friday, WXYZ-TV reported Saturday.

One blow penetrated Danyna’s heart, the station reported.

Prosecutors said Lewis screamed, “I’m going to kill her” as a teacher tried to shove her out of the classroom, according to the station. Continue Reading