TIMELINE: Delphi murder investigation

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The timeline in the Delphi murder investigation:

February 13, 2017: Libby German and Abby Williams are reported missing after visiting a trail outside Delphi.

February 14, 2017: The bodies of the teen friends are found on Valentine's Day, just out of sight of the bridge where they were last seen alive.

February 15, 2017: Police release a cell phone image the girls captured of their suspected killer walking across the bridge.

February 21, 2017: Police release an audio recording from the cell phone of the killer ordering the girls to go "down the hill."

July 17, 2017: Police release their first sketch of the suspect, drawn with the help of witnesses.