Then CB and SB had died no later than 1 am on May 6th (rigor fully set when found about 1 pm on May 6th) while MM died some time within the preceding twelve-hour period (rigor not set when found). It still works. However, it could also be as you surmised - LE interfered with the bodies. We know that MM's body was disturbed when they found it, for instance. As the article I linked earlier states, rigor and lividity are not the best determinants of TOD. If your point is that LE interfered with the bodies, IMO, that's very plausible, as I stated about MM's body. The big problem, IMO, is that TOD simply cannot be properly determined - and that's at least partially because of the ineptitude of LE on the scene, IMO.
No, that is not my point at all. My point was to point out that there's *possible* visible evidence of a fairly large discrepancy between Michael's time of death and that of the other boys (who were pulled from the creek almost an hour later, in full rigor). And that it seems probable that less than 12 hrs had passed from time of death to coroner's report.
http://books.google.com.au/books?id...epage&q=at what point is lividity set&f=false
^ In the above link, you'll see it stated that at around 8-12 hours after death, lividity no longer will shift if a body is moved from its original position, nor will it blanch under pressure (of a thumb pressing into it, as opposed to the kind of blanching which occurs with the pressure of the body's weight against a solid surface).
Kent Hale's report occurred some time after the discovery of MM's body. And in that report, the ME says that the lividity in the bodies, all three of them, was STILL shifting under applied pressure.
This suggests that *less than* 12 hours had passed between time of death and the observation of the lividity still blanching (do we even have a ballpark time for that report? it's late here and I'm in brain fart country). This might mean that MM's apparent lack of full rigor
might support the lividity as evidence of less than 12 hours being a ballpark region of time for the deaths (being that rigor is generally fully set after 12 hrs or so).
Looking at MM's body position on the bank (and forgive me for being a bit graphic here) - his legs appear to fold neatly one atop the other, as they would if the body was not set in rigor in an open position and then 'broken' out of rigor (by, say, police handling)... in any case, it really looks to me like MM was not in full rigor at time of discovery.
Which all *might* put up to 10 hours between last sighting and actual time of death, given that MM was discovered around 1.45 (and removed from he water an hour later..) - possibly not in full rigor yet - and Hale's report had to be somewhere around 4 pm (? ), with rigor but *not* lividity fully set in ALL bodies by then. So probably closer to 4AM for time of death, making a substantial gap between that and the last sighting.
^ was my point. Please the check the math, teach, it's deffo -not- among my superpowers.
Also, a secondary and unstated point: that documentation, from LE at the discovery site, to the coroner (and hey, quite a ways through the investigation), was
pitiful. Just pitiful.
ETA: and ofc, the most obvious point being, the idea of the boys' deaths occurring early on the evening of the 5th just seems implausible.