Do the math...
IMO, the M's started following Heather in the afternoon on the 17th.
The locations (and times when they come out) of the IE charges are too coincidental if you put 2+2. :twocents:
Then, add in the time and location of the pay phone call by SM and divide by the receipt found in Heather's car = stalking/pre-meditation (IMOO).
I agree on the stalking and premeditation. The only thing I don't get is how can these people be so stupid? The payphone I think shows the premeditation and also shows they thought that would be part of their cover. Then they send these sexual positions to Heather's phone? Dumb and dumber imoo.