then angila was murdered. investigators suspected the attack was personal and when they thought it was case close, it turns out it was not. so they set an elaborate trap hoping to catch a killer. here is keith morrison with prairie confidential. >> it was dark. moonless and nearly that morning. was there a muffled cry? the sound of a car making haste away? no one heard. not a thing. it's a modest place, minot, modest in a good way. and uncommonly friendly. comparatively speaking, of course. >> it is a family community. >> north dakota nice may be an old-fashioned phrase but still fits. >> people who have been around a long time to greet each other on the street. >> as they did that chilly morning in november 2015 when parents dropped off their kids at this elementary school and where later that morning at minot university department of nursing, a professor wondered why one of her students had not shown up for an exam. >> before we started taking the test, i said, has anyone heard from angila? >> angila was thi