Kelsie Schelling Latest: Colorado Bureau Of Investigation Dig For Evidence Monday

The Colorado Bureau of Investigation was out in force Monday, using backhoes as they resumed their search for clues to what happened to Kelsie Schelling. The Denver woman has not been seen February 4, 2013 when she left a doctor's office where she saw the first sonogram of her baby.

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Police say that she drove from Denver to Pueblo to see Donthe Lucas, the father of her child. He has been considered a person of interest in the case.

On Monday, a dozen officers were out in Pueblo digging on a property not far from Lucas used to live. Two weeks ago they had been digging up the backyard of the home where he used to live with his grandmother.

The day after Schelling was last seen, Lucas was determined to have parked her car at a nearby Walmart where an unidentified man picked it up and dropped it off a the St. Mary-Corwin Medical Center.

Police found the vehicle and seized it two days later.

Schelling was not seen on any surveillance tape from the Walmart or medical center.

The digging operation is expected to last into Tuesday.

Photo Pueblo Police Department