This would make a good case for Cold Case Files, or any one of the innumerable other police-murder shows. Except it's real. So you'd have to add a tearful confession or something like that.
But it's about a police officer who murdered his wife nearly thirty years ago, in 1982. Her skull was found in 1995. He was charged and convicted of murder only within the last couple of years. Sentenced to 25 years to life in prison.
You can kill your wife. You can sometimes get away with it. But even when you think you're in the clear, even when you think you've successfully dumped the body, even when you think they can't convict you on circumstantial evidence, sometimes you're wrong.