"Seeing that happening brings back all those memories," said Patrick Korellis.
Korellis was a student at Northern Illinois University when six people were killed at the DeKalb campus including the gunman. He says the shooting at Colorado reminded him of his traumatic experience.
Korellis says survivors from the Virginia tech shootings helped him overcome his fears. And that it takes time to heal.
"The first year is always the hardest," he said.
Korellis says he would like to talk with the family of Crystal Lake native John Larimer. The Navy sailor died protecting his girlfriend Julia Vojtsek in Colorado. She says she was saved by John's ultimate kindness.