Joyce Mitchell appears before Judge Buck Rogers in Plattsburgh City Court in Plattsburgh, New York, June 15, 2015
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June 15, 2015 12:17 PM EDT

Joyce Mitchell, the prison worker accused of helping two inmates escape in upstate New York, was investigated for a prior sexual incident with escapee David Sweat, sources familiar with the investigation told NBC News.

After the incident, which was investigated by prison officials, the other escapee, Richard Matt, charmed himself into her affection — so much that she “thought it was love,” sources said.

District Attorney Andrew Wylie said on Friday that Mitchell was previously investigated because of a complaint that she had a relationship with Sweat, but he said there wasn’t “sufficient information” to remove her from the prison …

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