Mystery behind murder of grandparents living out retirement dream

“20/20” unravels what happened to a retired California couple on the fateful day they tried to sell their 55-foot yacht.
1:55 | 01/17/20

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Transcript for Mystery behind murder of grandparents living out retirement dream
we're going to turn to a bizarre mystery about the murder of two grandparents living out their retirement dream tonight on "20/20" and unravels when they tried to sell their yacht. A story we first covered on "Gma" right after they went missing. A couple told a friend they were showing their 55-foot boat to a prospective buyer. But then the couple simply vanished without a trace. Before they disappeared Tom had mentioned to family members that this guy who was a child actor was going to be the buyer. Skylar happens to be a convicted felon on probation. The chilling details were laid out by one of the people who was on board that yacht and who took part in the murders. They're leaving Newport beach harbor like they've done many times before on board is skill Lahr Deleon and John F. Kennedy. They're taking the boat out for a test run. They have no idea what's in store for them. As they're heading out the plan kind of goes into formation. Jackie was pleading for her life. She was saying, you know, I just want to see my grandson. She's screaming to Skylar that we trusted you. Why are you doing this? Mr. And Mrs. Hawks tied up Tom is stroking her hand trying to comfort her. This is when you hear the part about Tom stroking her hand to put her at ease. It's one of the most poignant things I've ever heard in my career. It's okay, sweetheart. We're going to be together. Grabbed this huge anchor. They handcuffed them to the anchor is there Skylar stands up with a smirk and tosses this huge anchor off the boat. And then out an open door and they both fall into the ocean. Wow, what a story. You can see the full story tonight on "20/20" right here on ABC. Michael, what's coming up on

This transcript has been automatically generated and may not be 100% accurate.

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