Updated

The grandparents of one of two teenage girls slain during a winter hiking trip say they still believe investigators will find the killer.

Fourteen-year-old Liberty German and 13-year-old Abigail Williams of Delphi vanished Feb. 13 along a trail near Delphi, about 60 miles northwest of Indianapolis. Their bodies were found the next day in a rugged, wooded area.

More than two months later, Liberty's grandparents, Mike and Becky Patty, say they still have faith police will arrest whoever killed the Delphi teenagers.

Becky Patty tells WTHR-TV (http://bit.ly/2pAwxli ) she doesn't like to think about "the possibility of not ever knowing" who was the killer.

She says the couple is focusing on plans for a softball field and park honoring the girls, and that's helping them heal.

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Information from: WTHR-TV, http://www.wthr.com/