In a no-body case, how can a husband be prosecuted for murder?

People disappear all the time. Without a body and some forensic evidence, how are you supposed to know who or what is at fault for the disappearance? She might well have fallen overboard just as the guy says, or she could have been murdered, or anything in between.

You can't seriously convict a guy of murder with no evidence whatsoever, when he reported her missing pretty much immediately. Even if she was murdered, how in God's name does anyone expect to prove that? By now, her body has likely been eaten by the fishes.

In a no-body case, how can a husband be prosecuted for murder?
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