Erin Moriarty

According to Daniel, there was one point when he and his sister had to take care of their mom when she was diagnosed with a disease affecting the nerves in her face.

Daniel coped with his parents' behavior, he said, by slowly trying to starve himself.

Ultimately, he checked into an eating disorder clinic for 25 days.

But after treatment, he still sought other ways to harm himself.

At that point, Special Agent Campion leaned forward to have a closer look.

Daniel extended his arm.

Daniel told Campion that his parents never found out about those attempts on his own life.

At the time of the police interview, Daniel had just turned 16.

He had spent much of the conversation with Special Agent Campion discussing the many problems in his life.

But he also told him that his outlook on life had started to improve somewhat when he began to take antidepressant and antipsychotic medication.

But Campion didn't see this revelation quite the same way Daniel did.

He didn't think Daniel Marsh was actually getting better or healthier.

Campion had reached a far more chilling conclusion.

You're actually thinking that.

And why are you getting that?

Daniel had asked, what exactly are you guys trying to get from me?

Close to two hours into questioning, FBI Special Agent Campion revealed concerns over some of Daniel's online postings.

Daniel had an account on Tumblr.

It's a blogging platform where users can share videos, pictures, or text posts.

Daniel's page was public, but under a pseudonym.