One of two children found stabbed in an elevator of their Brooklyn apartment building was a cousin of a Chicago Bulls player.

Six-year-old Prince “P.J.” Avitto is the cousin of Chicago Bulls power forward Taj Gibson. He died from his injuries.

Gibson posted a photo of his cousin to Instagram saying: “They killed my lil super man. #rippj only two more weeks until your 7 birthday. Tears forever…this can’t be life #foreversuperman #babycuzz”

http://instagram.com/p/ovJLYLPm40/

The other stabbing victim, Mikayla Capers, 7, is fighting for her life at New York hospital.

Authorities have released a sketch of the suspect, who is described as a heavyset black male wearing a gray sweatshirt.

For more on this story, check out our sister station PIX 11’s coverage here.