ABC News’ Juju Chang speaks with Oakland County prosecutor Karen McDonald, who helped convict the parents of Michigan school shooter Ethan Crumbley.

Ashlyn Gosa, a senior at Apalachee High School in Georgia, was in class when she said she heard multiple rounds go off outside her door.

The 14-year-old accused of fatally shooting four people at his Georgia high school, and the suspect's father, made their first appearances in court, both charged in connection with the murders.

Annie Polhamus Brown says her nephew "was begging for help from everybody around him" and "adults around him failed him." Colt Gray, 14, will be tried as an adult and faces life in prison.

Colin Gray, 54, is charged with multiple crimes in connection with the Apalachee High School shooting and appeared separately from his son in court for their arraignments Friday morning.

Authorities said all teachers at Apalachee High School have an ID wherein they can press a button to alert an "active situation."

The teenager suspected in the shooting at Apalachee High School on Wednesday that left four dead had an apparent affinity for mass shooters, ABC News has learned.

When a gunman opened fire outside Stephanie Reyna's classroom, killing math teacher and football coach Richard Aspinwall, she said her classmates jumped into action.

Four people were killed in a shooting at Apalachee High School on Wednesday.

Colt Gray, the teen accused of opening fire at his Georgia high school, and his father, Colin Gray, both made their first appearances in the same courtroom.

Colton Gray is charged with four counts of felony murder for allegedly shooting and killing two teachers and two students at Apalachee High School on Wednesday.

A Georgia community is in mourning after four people were killed in a shooting at Apalachee High School on Wednesday morning, according to authorities.