Bryan Kohberger is expected to enter a plea deal Wednesday in the Idaho student killings. Still, key elements of the crime remain a mystery

With a plea deal expected in the Idaho student killings case, key questions a trial might have answered linger: How and why were these victims chosen? Why were other roommates spared? And how exactly did the killer get into the home, carry out the crimes, then avoid capture for weeks?

​ With a plea deal expected in the Idaho student killings case, key questions a trial might have answered linger: How and why were these victims chosen? Why were other roommates spared? And how exactly did the killer get into the home, carry out the crimes, then avoid capture for weeks? Read More Breaking News, Latest News and Videos | CNN