Kaylee Goncalves' dog Murphy started acting strange months before she and three friends were killed by Bryan Kohberger, her friends told investigators in newly released police reports.

When Moscow, Idaho, detectives entered the horrifying crime scene where four university students were found mysteriously stabbed to death on Nov. 13 – they discovered a major clue – a Ka-Bar knife sheath — lying on the bed next to one of the bodies. But the DNA they found on that sheath led them nowhere – at first.