WARNING: This story and video contains explicit language and a graphic description of violence. During a break in conversation aboard a yacht in Vancouver, Dean Penney sat relieved, with his hands over his eyes. "Been holding it for so long," Penney said to an undercover RCMP officer who was posing as a crime boss. "Kind of a relief." In the hours before, Penney had told the fictitious crime boss of his involvement in the death of his estranged wife, Jennifer Hillier-Penney, on Nov. 30, 2016 — and the steps he took to hide her body. "I took her. Moved her. I took her up to the bay where my cabin was, just took her offshore in my boat. And that's where she is. She'll never be seen. Then that's it. That's all I can tell you." Penney is charged with first-degree murder in Hillier-Penney's death. He has pleaded not guilty, and his lawyer said they are working to prove the confession was unreliable. The interview was recorded seven years to the day of her disappearance.…