Loved ones paid their respects Friday to a 15-year-old boy who was fatally stabbed in school by a classmate.

On Sept. 27, police say 18-year-old Abel Cedeno stabbed Matthew McCree with a switchblade following a dispute during their history class at the Urban Assembly School for Wildlife Conservation. Another boy was injured in the altercation. It marked the first slaying in a New York City public school in two decades.

The West Farms school is in the minority of schools without metal detectors -- something McCree's family and other critics say could have prevented the stabbing.

Aside from friends and family, Mayor Bill de Blasio made a brief visit to the Castle Hill Funeral Home to pay his respects to McCree's family.

McCree will be buried Saturday morning in Brooklyn.