PRM1 pilot reported an near midair collision on descent into ril.

Attributes
ACN	1228357
Time
Date	201412
Local Time Of Day	1201-1800
Place
Locale Reference	RIL.Airport
State Reference	CO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Premier 1
Operating Under FAR Part	Part 91
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Captain Single Pilot Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 5300 Flight Crew Type 1100
Events
Anomaly	Conflict NMAC
Miss Distance	Vertical 400

Narrative:

I was descending into ril for landing and received a traffic alert. The aircraft was below me and got to within 400 ft. Vertical. I stopped the descent and turned right. A few seconds after that; denver center controller told me to turn to heading 060; which I was almost to that heading on my own. The RA never activated.

Original NASA ASRS Text

Title: PRM1 pilot reported an NMAC on descent into RIL.

Narrative: I was descending into RIL for landing and received a traffic alert. The aircraft was below me and got to within 400 ft. vertical. I stopped the descent and turned right. A few seconds after that; Denver Center controller told me to turn to heading 060; which I was almost to that heading on my own. The RA never activated.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.