Just a possible theory about Thomas Morphey...........DP picks Tom up at the park and they go to the coffee shop and talk for a bit. DP tells Tom about all his troubles......Stacy wants a divorce, she's been seeing a bunch of guys, and they argued about it and she's left him. He's been out searching for her all day. He tells Toms he has to meet someone and will be back in a little while, leaves his cell phone there, telling Tom not to answer it. While DP is gone, the phone rings and Tom sees the caller ID showing "Stacy."
DP comes back to the coffee shop, bringing a bottle of whatever alcohol was Tom's favorite. He says, "hey the guy I had to meet gave me this bottle. I've already got a couple at home - here you go, my gift to you." He and Tom go to the Peterson home where Tom helps DP move a rectangular container from the bedroom to the Denali. Tom is a little shook up because that container felt warm to the touch. DP takes Tom home and along the way say, "go on take a swig, after being clean and sober for as long as you've been, you aren't going to get hooked again on just a couple of swigs." So, Tom opens the bottle and takes a couple of swigs.
After DP drops Tom off at home, Tom calls his neighbor and say he has to talk to him. The neighbor, Walter, says to come to the garage door. Walter smells the alcohol on Tom's breath when he comes in. Tom tells Walter about the evening's events and after a while Tom goes home.
After leaving Tom off at his home, DP goes to the canal area to dispose of the container. But with the diving weights the container is too heavy for DP to wrestle out of the back of the Denali himself and get it over the side of the canal. At 11:26pm Cassandra calls and DP realizes that Cassandra is out looking and his time for disposing of the body is getting short. He's got to dispose of the container and get back to the house before Cassandra comes to his house again. When he talks to Cassandra, he's out of breath from the exertion of trying to wrestle with the container himself.
DP drives back to Tom's house and knocks on the door. He tells Tom he's having trouble unloading the container at it's destination and he needs him to help him again. Tom is too scared of DP to refuse, and goes with him. They drive to the canal and get the container out of the car and over the side into the canal.
By this time, Tom is sure that Stacy is dead in that container. He's real shook up and trying to appear calm. DP says, "Hey, lets stop at Leo's for a bite to eat." When they get there, he orders Tom a drink, and then another, and by the time they leave, Tom is pretty drunk. DP reasons that the next day when Tom gets up he's going to be confused about the events of the night before.
The next day Tom remembers a lot and distraught by what he thinks he's involved in and he takes some tranquilizers to calm down. He overdoses and his girlfriend calls 911.
But, what DP didn't know is that Tom spoke to someone in between DP dropping Tom off, and then picking him up again later that night.