Richard Schlesinger (48 Hours Correspondent)

I said... You said he was a hero?

Yes.

Cox's partner, Doug Williamson, helped to calm Winger.

I was trying to let him know what we were going to do, how the police were going to help him.

After Donna and Harrington were taken away, Winger managed to give the detectives a detailed statement.

He told them that Donna was on her knees when he took aim at Harrington.

Harrington looks up at him.

Yes.

And he shoots him.

Because he's getting ready to go down and hit her again.

And then Harrington...

From what the position he was in, he said at that point he fell off of his wife and rolled back.

Like that.

Cox's investigation of the crime scene backed up Mark's story.

Basic evidence in here where the crime occurred matched up with what he was saying.

Everything matched up.

There was blood where Donna was killed.

There was blood where Harrington's head landed.

And the bullet was still on the table as he said it was from when he called 911.

What's more, Harrington had been a psychiatric patient with a history of delusions.