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it's true, it's like he vanished into thin air. >> is very confusing. the a's don't go missing. >> this one did and hasn't been seen since. was he murdered? was it suicide? did he just walk away? >> whatever happened here is well planned out. >> he was the first to investigate coast jerry sandusky. could there be a link between that case and his disappearance? >> somebody knows something or a lot of somebodies do. somebo >> hello and welcome to dateline. ray gricar was the first to invest in applications coast jerry sandusky sexually abused the child long before the scandal made head...

>> she never reached the surface. what happened some 80 feet down? prosecutors called it murder. a wife lost in the deep. a husband becomes the accused. >> did that happen? >> absolutely not. >> now, hold your breath for the twist. were captivatequa blue waters of tortola. hello, and welcome erwato dateline. scuba diver shelley tyer and her husband david swain were captivated by the aqua waters of portola. but for one of them , the breathtaking views would come at a deadly cost. the tragic twist that would expose family secrets as dark as they come. here is dennis murphy with the l...