(ABC NEWS) Indiana State Police today released a composite sketch of a man believed to be connected to the unsolved killings of eighth-graders Abby Williams and Libby German, and Abby’s mother says she hopes this is the “piece of the puzzle” that will lead to an arrest.

Abby, 13, and Libby, 14, who became good friends as teammates on their seventh-grade volleyball team, were enjoying a day off from middle school on Feb. 13 when they disappeared on a hiking trail near their rural hometown of Delphi. Their bodies were found the next day.

In the over five months since their deaths, no arrests have been made.

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