Forensic Evidence; Cause of Death?
Hello! Wasn't her bike found on a bridge? Was it over the S. Arkansas or some other creek? If she washed up in Fort Smith, AR and her bike was found near a bridge he could have easily claimed she must have fallen in. The water washes away any forensic evidence and the fish and current make any kind of physical exam to determine cause of death impossible.
@sk716 Welcome to Websleuths.
Sure BM could make a claim like that. Iirc early on, BM listed several possible causes for SM's disappearance, including getting in the water.
If post is saying Med Examiner could not determine CoD for remains found washed down river sometime later, respectfully I doubt that situation would
necessarily preclude ME's CoD & MoD rulings.
If remains were located & recovered in river, and
toxicology test results indicated lethal levels of a substance (strychnine, arsenic, other poison, cocaine? I'm not sure which would remain in the system or how long), ME might be able to rule on CoD.
If SM's remains were recovered in Ft. Smith or
anywhere w several
bullet holes in skull, ME might be able to rule on CoD, and on MoD as homicide.
Of course, none of the above would necessarily implicate or exculpate BM as the perp.
If placing dead spouse into a small creek/river
(like pix I've seen of it close to their home) and relying on remains never being found or significant decomposition before being found, seems person is counting on some luck: body not getting hung up on a log, rock, obstacle; hikers, bikers, fishermen not spotting the body, etc.
If killing was
premeditated & if body was placed in the river, seems method of
disposal was not well planned.
Personally not inclined to think SM's remains were placed in the river, could be wrong. my2ct.