raywest

Answer: They were sailing on Puget Sound, not the open sea. This is a relatively narrow inlet that cuts into Washington state from the Pacific Ocean. Land is on either side and there're many islands. However, it's unlikely Nick just swam ashore as the water's year-round temperature is too cold for any long-term survival. Most people die from hypothermia within 30 minutes. It's possible Angie had a small boat and picked him up, but I'd guess that Nick hid a small, self-inflatable raft on the boat and paddled ashore. He likely positioned the sailboat close to land before staging his disappearance.

raywest ★

Answer: Nick used Angie to help fake his death, frame Libby, and collect the insurance money which would have gone to their son, Matty. It's unclear if Nick married Angie, who became Matty's legal guardian, but he needed her to gain access to the money. He certainly didn't love her, and once he fully controlled the money, he eliminated her, as she was a liability who could have exposed him. I agree with the other answer that it also simplifies the plot by killing off a secondary character. It also shows how devious, ruthless, and sociopathic Nick is.

raywest ★

Answer: I don't think they explained it, but most likely for her insurance money which is the same reason Nick faked his death in the first place. But it's also possible her death was faked as well. Looking at it from the prospective of the writer, it seemed it was easier to kill her off or get rid of her somehow instead of her showing up at the end with Nick and there wouldn't be a way for Libby to kill her without facing jail time for it and it wouldn't make sense for Libby to just forgive her and let her go.

Bishop73

Answer: Because there were exceptional and extenuating circumstances and, technically, Libby was never guilty of the crime she was convicted of and had to resort to extreme measures to prove her innocence. She may have had a gun, but it could never be proved that she held Nick at gunpoint, only that she shot him in self defense. Also, it's a movie, which often are unrealistic regarding details like that.

raywest ★

Answer: She was completely in on it from the beginning and helped Nick carry out his plan. They had been having an affair.

raywest ★

Answer: It's obvious it was him. Nick lured Libby to that specific mausoleum, knocked her out, and dragged her into the crypt before closing the doors behind him. He then paid off the kid who acted as a decoy. Nick was motivated to get rid of her (though it was implausible that he would have left her alive before putting her into the casket). There was no-one else who could or would have done that.

raywest ★