Overview
- The Jefferson County Sheriff's Office ended its months-long probe and found no probable cause to charge the parents with providing a firearm to a juvenile or violating Colorado's secure-storage law, leaving the case closed unless new evidence emerges.
- Investigators said the Smith & Wesson .38 Special used in the attack was traced to a 1966 Florida purchase and described as a grandparent’s heirloom stored near the back of a large, locked gun safe.
- Court-ordered DNA testing of the revolver excluded both parents as contributors, establishing no evidentiary link between them and the weapon.
- Detectives reported difficulty securing direct interviews with the parents for much of the investigation, and a Jan. 23 letter from their attorney disclosed the heirloom ownership and asserted the teen lacked regular access to the safe.
- Authorities documented the shooter’s fixation on prior school attacks and violent extremist content, with FBI and ATF assisting aspects of the inquiry, and confirmed the two students wounded on Sept. 10 survived.