An anonymous donor provided the reward money to the Woodland Park Police Department, which is leading the search for 29-year-old Kelsey Berreth.
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Berreth was last seen on surveillance video entering a Woodland Park grocery store on Nov. 22.
MYSTERY TEXT: Search intensifies for missing Colorado mom Kelsey Berreth who vanished on Thanksgiving
Her fiance, Patrick Frazee, told investigators the couple met that day so he could pick up their 1-year-old daughter. They did not live together.
Police Chief Miles J. De Young said in a statement Sunday that a search of Frazee's 35-acre property was completed. The property was returned to Frazee.
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Police have not called Frazee a person of interest.
Woodland Park is 50 miles south of Denver.