Skip to content
Unsolved homicide

Killing of Percy Sierra

Year
2008
Where
Denver, Colorado
Source
Colorado Bureau of Investigation
Evidence
1
What the record says

On the morning of Thursday, March 13, 2008, family members went over to the residence of Percy Sierra after several unsuccessful attempts were made to contact her by phone. Upon arrival at Percy's no

From the Colorado Bureau of Investigation cold case file. Records change. The source is the authority.

Where to start

Got ten minutes? Do one of these.

What does the record establish, and what has never been explained?

  • Read the source and write down every date, place and name it gives.
  • Find the earliest news report you can and note what it says that later accounts dropped.
  • List what has never been explained. One line each.

New to this? Read the field guide. Five short lessons.

Coverage and records

What is out there.

Nobody has researched this case yet. Have the AI search the web for reporting, podcasts and videos about it.