Richard Allen was armed with a gun when he came across teenage friends Abigail "Abby" Williams and Liberty "Libby" German near a hiking trail in Delphi, Indiana, in February 2017, then used "power and the fear" to force them "down the hill" before slitting their throats,

Opening statements were expected Friday in a double murder trial in this small Indiana farming community near Purdue University that led to the death of two teenage girls seven years ago.