via.kdvr.com
Final report into ambush that killed deputy Zackari Parrish released
CASTLE ROCK, Colo. -- The investigation into the New Year's Eve rifle ambush that left Douglas County sheriff's deputy Zackari Parrish dead and four others injured has concluded. Even though detectives knew who the killer was right away, documenting the complex and chaotic events at Matthew Riehl's home took eight months.