That is extremely close minded and prejudicial of you. It may be proof of littering; of abuse of a corpse; an environmental pollution crime; or even of an attempt to defraud, by a mortuary illegally disposing of a body after taking fees for burial; but, is hardly rises to the level of proof the person was murdered.
Just the mention of "cement anchors" is inflammatory, as it brings to mind the alledged use of "cement overshoes" by supposed "gangsters" to allegedly dispose of bodies.
It may also have been the result of a bizarre suicide with the intent of framing someone for murder.
Why, it could even have been an attempt gone awry of a deranged person attempting to prove their faith via the miracle of walking on water, while wearing cement overshoes.
We must keep an open mind to the point all reason falls out, according to Mr. Schulman
I get the feeling that you are not taking the author very series.