Lake Crescent, an incredibly deep and beautiful lake on the northern Olympic Peninsula, was said to be haunted by the native tribespeople for generations, but there's a spooky and true story told about one of the few corpses ever sunk in the depths of the icy lake that resurfaced -- Hallie Illingworth, the "Lady of the Lake".
Hallie Illingworth was a waitress at the Lake Crescent Tavern who was strangled by her beer distributor husband in 1937, her body dumped in the lake and probably assumed never to resurface, but it did, three years later and turned almost completely to soap. Her husband was convicted based on some dental work found in her soapy, preserved corpse and rope fragments that could be traced to him. He served several years in prison and then fled the state.
There's a bunch of great campgrounds on that lake, and now you have a beautiful excuse to go stay there. Enjoy the swimming!