Since the shooting that killed 17 people at Marjory Stoneman Douglas High School, much has been discussed about gun control, mental health and what drives someone to commit such a horrible crime.
Shortly after that shooting, a man from Colorado wrote a letter to a TV station in Denver -- saying "I was almost a school shooter."
In the letter, Aaron Stark said, "I didn't carry out anything, I didn't hurt anyone. But in 1996, I almost did the worst possible thing."
The letter has gotten a lot of attention in recent weeks.
Stark joined WGN Morning News Monday to talk about his letter, and what led him to "almost" become a school shooter.
Watch the interview in the player above