A plane crash in Niwot a few weeks ago Saturday has left 3 dead. A mid-air collision happened around 9:00 AM. One of the planes involved was flown by a flight instructor and a student pilot, both died.  The pilot of the other plane was also pronounced dead. 

Cites

https://kdvr.com/news/local/3-victims-identified-in-mid-air-collision-in-boulder-county/

https://www.hindustantimes.com/world-news/3-die-as-2-planes-collide-midair-near-denver-how-on-such-a-clear-morning-101663473299987.html