Supermarket massacre shooter left chilling online trail

A man who police say trapped and killed three co-workers inside a closed northeast Pennsylvania grocery store overnight Thursday left an online trail behind that includes praise for the 1999 Columbine High School shooters and expressions of deep frustration about the world around him.
Wyoming County District Attorney Jeff Mitchell said a Twitter feed that includes a 42-minute film about a violent massacre, posted about the time of the killings, is believed to have belonged to 24-year-old Randy S