Police Release Interrogation Tapes in Kayak Murder Mystery

Angelika Graswald is charged with the murder of her fiancé Vincent Viafore.
1:48 | 09/12/15

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Transcript for Police Release Interrogation Tapes in Kayak Murder Mystery
Next tonight here, the ABC news exclusive. The woman accused of killing her fiancee in his kayak. Elizabeth vargas with the interrogation tapes. 911, what is your emergency? My fiance fell in the water. Can you please call anybody? Reporter: Angelika graswald was kayaking with her fiance, Vincent viafore, north of new York City on the Hudson river. He's getting further and further away from me. He's going to drown. Reporter: With no life jacket, viafore, who had been drinking, sinks into the cold water. His body not resurfacing until weeks later. But police are suspicious. They question graswald for nearly 12 hours. The video obtained by ABC news, airing here for the first time. It shows graswald cooped up overnight, stretching in various yoga poses. Prosecutors say eventually she admits to tampering with viafore's paddle and removing the drain plug on top of his kayak. Why didn't he have that plug in there? He didn't have it because I guess I had it. Reporter: In the video, she never says she was trying to kill viafore. Graswald has been in jail charged with murder since may. Her defense lawyers say she did nothing to cause her fiance's death. We're trying to avoid her being the victim of a second tragedy. Reporter: Attorneys have taken kayaks out on the Hudson river to try and recreate what may have happened that day. And they say there is no way a missing plug would have caused the kayak to sink. You've been tracking this case. Were there ever any signs of violence? Reporter: The autopsy report out today shows no serious injuries to Mr. Viafore's body. Nothing that would show he was hit or shot and rendered unable here. The woman aedccus of killing her fiancee.

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

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