A Really Strange Death

I wonder why Terry Martin Carr and his daughter, Arieka were found dead in their Jeep? It seems that he dumped all of his old mementos in some pasture and there is no sign of why they died. Also how he left his wife in the restroom was pretty weird as well. I wonder if it was murder/suicide or what. It's a strange case and I agree with the feeling that it is "totally bizarre."