James Crumbley trial: Asst. principal learns of shooting

Kristy Gibson-Marshall worked as an assistant principal for Oxford High School when the shooting took place. Gibson-Marshall was the first adult to interact with the shooter. She also was the first to identify one of the shooting victims, and she also recognized the school shooter.

Oakland County forensics officer discusses shooting

Robert Koteles, a forensics officer with the Oakland County Sheriff's Office, takes the stand to discuss details of where the shooting occurred at Oxford High School and evidence he collected in the incident on day two of James Crumbley's involuntary manslaughter trial.

James Crumbley trial: Forensic analyst tesifies

Edward Wagrowski, a former forensic analyst who now works with the U.S. Secret Service, told the jury it was hard to watch school buses of kids showing up and parents waiting to be reunited with their children following the shooting.

James Crumbley trial: Prosecutor's opening statements

Prosecutors said James Crumbley, father of the Oxford High School shooter, is one of "three people in this world criminally responsible" for the deaths of four high school students. "That nightmare was preventable, and it was foreseeable," Prosecutor Marc Keast said.