Seth Needler teaches biology at the high school and was holed up in his classroom with his students when freshman Jared Padgett opened fire and killed fellow student Emilio Hoffman last week.

Needler says he's had enough.

KBND : "Did you know the student, Padgett?"  NEEDLER: Actually I did. I had him in my class.  I knew he liked guns.  He talked about his guns.  Obviously they were his Dad's guns, but he clearly had access to them.  He liked to go hutning.  I didn't think there was anything wrong with that.  No one can understand, including his family, why this happened."

Needler plans to lobby for more gun control.

"People say it's not guns, but mental health.  But trying to solve mental health seems like a huge problem.  It seems like it would be quicker to solve the access to guns.  So when you have someone who is concealing suicidal thoughts and depression and doesn't have access to guns, this kind of thing wouldn't happen."

Following the Troutdale school shooting, Needler posted on Facebook a description of the shooting that's been shared more than 14-hundred times.