DELPHI, Ind. (AP) - A relative of one of the northern Indiana girls slain during a hiking trip plans to speak publicly this week.

State Police Sgt. John Perrine (PEH'-rine) says 14-year-old Liberty German's grandfather will make a statement during a Thursday news conference in Delphi, but won't discuss the ongoing double-murder investigation.

German and 13-year-old Abigail Williams were found dead Feb. 14 in a wooded area near Delphi, about 60 miles northwest of Indianapolis. They vanished the day before while hiking.

Authorities have released two grainy photographs of a man they consider the main suspect in the killings and audio of a male saying "down the hill." Police say those came from German's cellphone.

A reward fund for information leading to an arrest in the case has grown to nearly $220,000.