Colosimo was on a roof when he received an electrical shock and fell off. His cousins called 911 and resuscitated him until help arrived.
Colosimo was rushed to the hospital where his days-long fight began. School officials say Colosimo suffered an embolism - a blood clot reaching his heart - and he died at 3:30 p.m.
The entire front lawn of Juan Diego was packed with people Tuesday evening.
Molly Dumas was mourning the loss, along with friends and family.
"As you can imagine this is a tough one, the Colosimo family have been wonderful leaders in our community," said Dumas. "Adam's uncle is the principal of this school it's a really hard thing for our community."
This is the first student death at Juan Diego.
The school plans on holding a mass for Colosimo soon.