DENVER — A teenager suspected in a shooting attack at a suburban Denver high school that left two students in critical condition appeared fascinated with previous mass shootings — including Columbine — and expressed neo-Nazi views online, according to experts. Holly shot himself following last Wednesday’s shooting at Evergreen High School in Jefferson County. Two recent suspects in school shootings were active on the so-called “gore forum” that Holly used called Watch People Die, according to the ADL. A few days before Wednesday’s shooting, Holly posted a TikTok video posing similarly to how the Wisconsin shooter posed before killing two people in December. Holly posted a photo of two patches that he had but said the Velcro on the back had fallen off.