Idaho student killer heads to prison, but mysteries in the case remain

Bryan Kohberger pleads guilty to the brutal murders of four students in Idaho, sparing him the death penalty. The plea deal leaves families with unanswered questions about the motive behind the killings. Kohberger's past struggles with depression and a former heroin addiction have been scrutinized, but his reasons remain a mystery. Social media sleuths, investigative journalists, and law enforcement worked to piece together the puzzle of the tragic event that shook the close-knit college town of Moscow, Idaho.