Anne-Marie Green

Dan Nylon says when he first discovered the recording, he could see Melissa and her husband Bruno arriving home from their night out.

But it was difficult to make out most of what they were saying.

Greg Allen says that one thing was clear.

Allen says the original investigators told him they had no way to review the recording because they didn't have access to the necessary technology.

But Allen's team did, and could now see that the recording begins in the driveway, where you can hear the couple arguing.

But it doesn't seem to end there.

Once inside the house, it sounds like they're still arguing, says Allen.

The sound was just much harder to hear.

But with Bruno's changing stories and possible evidence of an argument, investigators were now treating Melissa Recuba's death as a possible murder.

Then Lackawanna County District Attorney Mark Powell agreed.

Because who would purposely shoot themselves in the hand?

Sure, sure.

With Powell's team now on board, Melissa's family was informed that the case was once again active.

Chelsea says she now had mixed feelings about her relationship with her father.

I live next door, so my son's very close with him.

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?