One teenager remains in critical condition Thursday after an unidentified student shot two of his classmates at Evergreen High School in Jefferson County before shooting himself.

The student who opened fire Wednesday at Evergreen High School, injuring two other students, died Wednesday night of a self-inflicted gunshot wound, the Jefferson County Sheriff’s Office said. One student remained in critical condition, according to doctors. Both remain in the hospital, according to sheriff officials.

Investigators said the shooter who shot and injured two students at Evergreen High School on Wednesday kept shooting and reloading, according to the Jefferson County Sheriff's Office, and that much of the credit for saving lives goes to the students and staff.

Classes were canceled for the rest of the week at Evergreen High School after a shooting shook the school on Wednesday, leaving two students hospitalized and the suspected assailant dead.

The suspected shooter, a boy wielding a revolver, was a student at the school. His name has not been released, nor has his motive.

One of the students critically injured during a shooting at Evergreen High School on Wednesday has been identified as 18-year-old Matthew Silverstone.

A male student died after he shot and wounded two of his peers at Evergreen High School before turning the gun on himself Wednesday.

Evergreen High School will be closed Thursday and Friday as the Jeffco School District reaches out to families to connect them to mental health services throughout the community southwest of Denver.