Deborah Roberts

I knew immediately within minutes of sitting down to talk to him, Riley Gall wasn't going to confess to anything.

He wasn't going to do it.

Detectives then turn up the heat, pressing Riley about an odd question he had for his friend Noah.

How to get fingerprints off a gun?

It's more like a horn.

It was, yeah, Abel would be putting it mildly.

Everything about the interview, his answers, his body language, it's screaming that he's got something to do with this, that he's involved in some form or fashion.

Riley Gall has gone from person of interest to suspect in the death of Emma Walker.

I do want to thank you for coming in and talking to us.

I do appreciate it.

Following Riley's interrogation, he reaches out to his friends and he's really angry.

So what are you making of this?

That's when the two friends, Noah and Alex, start to realize that something's really wrong here.

What's his demeanor like?

Riley starts scheming ways that he can help his friends backpedal out of what they said.

But what Riley doesn't know, his two friends have a plan of their own.

They want justice for Emma, and to do it, they're going to have to go undercover and get it all on tape.

He said he wanted to go and throw the gun away.

The teens decide to work with police to lay a trap for Riley.

So the two friends reach out to the detectives and offer to help in any way they can.