Generation Why - #25 - The Scuba Mystery

Summary: David Swain & his wife, Shelley Tyre, went on a scuba diving trip in the British Virgin Islands. Leaving friends on a boat awaiting their turn, the couple dove in. After 30 minutes only David would resurface. Once Shelley was located, her lifeless body could not be revived. Was David a murderer? Or was this an unfortunate accident?