That is true, lack of a body makes it very difficult to get a conviction, despite a boatload of circumstantial evidence. But DNA technology is making that harder and harder to accomplish.
There was a case in my hometown of Newtown, CT, which turned out being the first major case to get a murder conviction without a body back in the late 1980s. This was the infamous "woodchipper" case that supposedly was an influence on the movie "Fargo."
It took investigators months of hard work to put together a case, including going through landfills. Eventually they dredged a nearby river (Lake Zoar area) and came up with ground up body parts. It's really a grisly case and the guy almost got away with it.
As a side note, they released the guy from prison recently and he's now a free man. Just goes to show that a life sentence is not necessarily a life sentence.
Her DNA, and his DNA are all over the van. They lived in it for months.
Presence of DNA does not equal proof of murder.
Unless you can find it somewhere where it is not supposed to be.
Divorce . . . Connecticut style