There was also a guy in Arizona a couple of years ago. His wife and stepchildren turn up missing. The truck is found in a grocery store parking lot. Bodies are never found. The guy is on death row now.
There are numerous examples of solid murder convictions for cases in which the body is not found.
There was a guy in Florida about 5 or 6 years ago, who moved into a girlfriend's trailer with her and her little daughter. I think his name was Crane or Crain. Something like that. Anyway, the girl went missing about the same time he did. No body, no witnesses, no confession. But he was given the death penalty by a jury who saw lots of strong forensic evidence of a violent episode involving the defendant and the girl.
But no matter how much evidence there is, some people are never convinced. They'd have to see it with their own eyes and even then, they would doubt what they saw. Some of them just like to argue to the point of absurdity.