I posted this a LONG time ago, but will give my thoughts/theory again. I think SM's intent that night, wasn't to "lure" her, or anything bad. I think he had been "good" for a while since TM had his phone or at least he knew she was checking it, so he wasn't able to contact HE that night using his cell. So my theory is that he was out working and was finished and thought perhaps he'd give a quick call to HE and see if he could convince her to see him again. Probably thinking he could get laid or whatever. That's why the payphone(which would probably have been in between his work that night and his home and Heather's apt. Now, it seems to me that he called her and she said no initially. Or she said let me think. Either way, she then called Bri. Then at some point(I think it was 10 or 20 minutes after his initial call) she calls the payphone back. No answer. So she then calls his cell(not knowing that he has either arrived home now, or that TM actually has his phone)
From what I remember, it wasn't answered at first, but eventually after a call or two from her to SM's phone, it was answered and a 4 minute phone call ensued. I believe that TM MADE him answer that call, and MADE him tell her to meet at PTL. It appears from her phone pings that she then headed to PTL, as did the M's from the video evidence we've seen. She arrived first. Called him a couple times probably to say "I'm here, where are you?" etc.
Eventually, he shows up, she locks her car up and takes her keys and her phone, and jumps in the passenger side of the truck. TM is sitting in the back seat of the truck ducking down, and as soon as the door is closed she reaches up and somehow strangles hurts her neck. This won't hardly leave any DNA in the truck. No gunshot to hear. No knife to try to clean up blood/dna.
This seems the most plausible and explains the phone calls perfectly in my opinion. The only problem I have is these two don't seem bright enough to do the perfect crime, so how in the world did they then go and put her body somewhere that it couldn't be found. The only way it seems possible is that they panicked and placed her body into a dumpster that was then picked up unknowingly the following day or so and dumped at the landfill. I know there are so many trucks dumping each day there, that by the time a week or two later when they began searching, the landfill would have been completely dumped over and over again on top of previous loads.
Does any of that make sense? Or am I missing something?