Peter Van Sant

Then, Chris Doverson moves on to that $50,000 check.

Eric doesn't know a handwriting expert has determined that his father's signature is a forgery.

It's a recreation of his signature.

Eric now knows where this questioning is going.

Eric is allowed to leave the interrogation room.

But minutes later, his life changes forever.

Today we're satisfied to have made an arrest in the case.

Deputy slapped on the cuffs in the parking lot.

Eric Cola arrested today on two counts of first degree intentional homicide.

For Eric's wife, Christine, the idea that Eric could harm his parents is simply absurd.

It would take two years for Eric's case to wind its way to trial.

Investigators had uncovered that $50,000 check, Eric's large debts, and a shaky alibi.

Finally, in June 2012, La Crosse County District Attorney Tim Grinke begins the case against Eric.

And the truth is, the defendant is guilty of murdering his parents.

Co-prosecutor Gary Freiberg says that desperation led Eric to kill the two people who had long financed his life.

Why would he kill the goose that laid the golden egg for him?

Well, I think it's because the goose was saying, no more eggs.

In a risky move, Eric takes the stand.

You wanted to get at the money that you knew was going to be or should be yours someday, right?

You wanted to speed up that inheritance process, didn't you?