Where's the "proof." A lot of people use cement for anchors. It's heavy. Maybe some one else killed her with their anchors. They could have used the same type of cheap containers to make them.
Where's the proof those cement weights were the same weights he made? Was there DNA? Finger prints? No, there wasn't. It was assumed only because it made sense. The jury used reason, not just the few hairs they had, to decide his case.
“The jury used reason, not just the few hairs they had, to decide his case.”
Like considering among other things Amber Frey’s statements, Scott admitting loading a blue tarp onto his boat while in his driveway that he claimed was umbrellas, $10,000 cash in Scott’s hands 30 miles from the Mexican border, and Lacy’s body being found in close proximity to where Scott was fishing even though her car was still at home. Much stronger circumstantial case there, two different cases.