I know Tom was having problems with his phone--pretty sure both friends and family have said this. When the friends that were going to drive him to Sartell on Saturday tried calling him around noon, his phone was either off or dead (correct me if I'm wrong). We know that his phone pinged at Larry's RV. So one could assume that it pinged at Larry's before it must have died or been shut off sometime before noon Saturday. I doubt the killer/s would be moving a dead body during daylight. Sun rose at 7:12AM that day, so if we are to believe the last people he was with, he died between 3:40AM - 7AM. It's possible he could have been killed before 3:40AM, but then his friends had to have known or been involved with his death to be lying. I know the experts are very good about narrowing time of death, even if the body has been there for a few days. Obviously if it was before 3AM that day, the people he was with that night would be looking quite suspicious.