Anne-Marie Green

It's not black and white.

Investigators then sent a portion of the DVR recording to an FBI crime lab for enhancement.

DNA testing was also ordered on some of the blood evidence, and a forensic expert was hired to help determine how the shooting took place.

About a month later, the enhanced DVR audio was back, and Dan Nylon says it was clear the couple had been arguing right up until the moment the gun went off.

What do you hear on that tape?

It's still hard to make out every word, but the official police transcript notes that Bruno and Melissa can be heard cursing and calling each other names.

The transcript also notes the sound of a dog barking.

Then Melissa shouts, I didn't do anything.

Listen closely.

Nearly 30 minutes after they first pulled into the driveway, Melissa told Bruno that he had to leave because of something he'd previously done hundreds of times, said Melissa.

A bit later, Melissa can be heard talking.

Then it sounds like things are being thrown.

Just seconds later, the gun goes off.

Joanne says she hasn't been able to listen to the recording, but has read the transcript.

I was horrified.

Of course I cried.

Also horrifying is the sound of Chelsea screaming after her father called her over and she first discovered her mother.

She says she doesn't remember questioning her father that night, but she did.

And Bruno's answer gave police yet another version of his story.

He implied that Melissa had been the one holding the gun.