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Missing

Mark Bonner

Year
1978
Where
Boulder, Colorado
Source
Colorado Bureau of Investigation
Evidence
1
What the record says

Mark Allen Bonner disappeared under suspicious circumstances while house-sitting at a residence on Neva Road, north of Boulder, on March 20, 1978. Investigation at the time implicated him in drug traf

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 is the last confirmed sighting, and what is the documented timeline around it?

  • Pin down the last confirmed sighting: who saw them, where, and when.
  • Build the 48 hours before and after from what is on the record.
  • Check for unidentified persons found in the region after that date.

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