Six years after Heist went missing, Lititz police invited the Lancaster County Major Crimes Unit to join them in conducting a cold case investigation.

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In recent years, Hasse played major roles in Kaufman County's most high-profile cases, including one in which a justice of the peace was convicted on theft and burglary charges and another in which a man was convicted of killing his former girlfriend and her 10-year-old daughter.

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The central Colorado county sheriff's major crimes unit said it has received more than 100 solid tips about the incident, including a growing number of witnesses describing a black car then in the area.

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