We worried about that because we basically had no eyewitness and no confession, no admission, no proof of a solid motive.

Basically we had DNA on a beer can. I'm Scott Weinberger, investigative journalist and former deputy sheriff.

I'm Aniseika Nicholazzi, former New York City homicide prosecutor

and host of investigation discoveries true conviction.

And this is anatomy of murder.

A lot of us probably have an idea of how we'd like to spend our golden years,

maybe near a beach somewhere, traveling the world, or tapping away at our memoirs,

and if we're lucky, doing it side by side with the ones we love.

But of course no matter how hard we work or how big we dream, not all of us are that lucky.

Leo Beauregard was a world war team. not all of us are that lucky.

Leo Beauregard was a World War II veteran and a successful businessman who along with his wife

Noella had moved from Massachusetts to South Florida back in 1972 to enjoy a semi-retirement in the sun.

Leo and his wife settled on Singer Island just north of Palm Beach, happy to put those New England

winters behind them for good. But when No wella

passed away in 1980, Leo suddenly found himself living alone.

Ten years later, Leo had moved to a nearby condo in North Palm Beach and he also had tried to move on with his life

making new friends who were up for the kind of trips that he had always planned to take with his late wife.

And in June of 1990, Leo had planned one such trip to go visit extended family up north.

Well, that morning Leo Beauregard was scheduled to go on a road trip to the northeast with a good friend of his and when the friend arrived to pick him up he wasn't answering the door, he wasn't responding.

That's the voice of then county prosecutor Aletha Mc Roberts, a native of Palm Beach County

and a veteran of over 300 homicide trials during her 40-year career.

Leo was 68 years old and lived alone, so when he didn't answer the door, his friends

...