Long before confessing to killing four college students, Mr. Kohberger wrote of being depressed as a teenager and became addicted to heroin.

The plea deal that spared Kohberger's life required him to admit the elements of the crimes he committed, but it didn't force him to provide a narrative or say why he did it. That has raised questions about whether prosecutors could have or should have insisted on a full confession — including motive — as a condition of the deal.

At his sentencing hearing, Mr. Kohberger declined a chance to speak about the case. Some families said they wanted answers.

New documents detail strange occurrences at the house where four Idaho college students were killed and what a friend of Bryan Kohberger told police.

Now, the state of Idaho has sent Kohberger to the Idaho Maximum Security Institution in Kuna, the Idaho Department of Corrections confirmed to ABC News. The facility is about 20 minutes outside Boise,