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Allen was arrested last Wednesday by detectives with Delphi's double homicide task force

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McLeland emphasized that the investigation was still "active and ongoing" as of Monday morning, and authorities are continuing to ask the public for any tips related to the 2017 killings, whether they relate specifically to Allen or no

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Libby German’s grandmother is surprised the man arrested for Libby’s murder lived in Delphi. “For it to be one of us, it’s hard

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Libby German's grandmother and guardian, Becky Patty, was surprised to learn the man arrested for the murders of Libby and Abby Williams was a Delphi resident

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This marks the first time a suspect has been named in the mysterious double murder. Police have still not released how the girls were killed

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A Delphi, Indiana, man, Richard Allen, has been arrested for the 2017 murders of eighth graders Abby Williams, 13, and Libby German, 14

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they were killed in the middle of the day on Feb. 13, 2017

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For Libby's sister, the arrest brings "new obstacles and emotions that we have to learn how to deal with