Best I can tell this guy is resting his thesis on the notion that "no crime scene was found".
That's what happens many times when you murder someone out in the Bay ~ doggone crime scene just moves around like water, and fritters away. Guess everybody who ever did that ought to be turned loose ~ can't find no kinda' crime scene FUR SHUR.
Dumping a body weighed down by cement anchors is plenty proof of a murder having occured to me.