Reading both of your comments on this thread, my first thought was about the case against Thomas Capano and the murder of Anne Marie Fahy back in the 90s. Capano had been a high profile attorney in Delaware, and was convicted without a body every being found.
Wikipedia actually has a page dedicated to murder convictions without bodies. It’s certainly not common, but it’s by no means unheard of. Here’s a link to the United States convictions:
https://en.wikipedia.org/wiki/List_of_murder_convictions_without_a_body#United_States
Sometimes a dingo really did eat the baby.