Erin Moriarty

It must have been terrifying for Daniel, who started banging on his father's chest.

something Daniel later said he had seen on a medical drama.

It worked.

Daniel had saved his father's life.

About a month later, Daniel was presented with an American Red Cross Heroes Award.

Sure enough, there was Daniel, featured in local newspapers, hailed for his heroism.

In photos, he looks innocent and sweet, wearing a suit with a rosebud in his lapel.

his father proudly standing beside him.

The next year, Daniel enrolled in the Davis Police Department's Youth Academy, receiving instruction on crime scene investigation.

But while Daniel may have appeared a model citizen on the outside, he was also harboring a dark side, something Bill said he didn't notice until after his heart attack.

You know that he told counselors that he was actually killing animals before then.

Did you have any sense of that?

But he told the FBI agent that he had thought about killing your wife's... Lover.

Lover, that he thought about killing her.

That was two years earlier.

As Daniel entered the Yolo County Courthouse almost a year and a half after Claudia Maupin and Chip Northup's murders, a judge and jury were about to decide his fate.

On Tuesday, September 2nd, 2014, the long-awaited murder trial against Daniel Marsh, now 17 years old, began at the Yolo County Courthouse.

Daniel had been charged as an adult with two counts of first-degree murder.

Prosecutors concluded that he had, quote, committed a very adult crime in a very adult manner.

And then, just three months before the trial began, Daniel changed his plea from not guilty to not guilty by reason of insanity, a clear indication of the defense to come.