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...