Denver police received a tip in January 2021 from someone who cited concerns about that the man responsible for shooting and killing five people and injuring two others in Denver and Lakewood last week but decided at the time criminal charges were not warranted. That investigation is being reviewed.
The suspect in Monday's metro Denver shooting spree foreshadowed the rampage in a series of books he wrote under a pseudonym, and used the names of actual victims in his writings.