but when detective john o brien and tyler bay learned about gavin s addiction, they had to consider a raft of new possibilities. he disappeared. maybe i overdosed. we didn t have any of those answers. driving all over the valley, we would have moments in the car of where we looked at each other and said i think this is a suicide. and then an hour later, we would interview something or somebody would happen and i say i think this is a murder. and our feelings and our gut instifkts were going different ways. that has to be unusual. it was very confusing. confusing for lisa, too. because here was another secret. the smith s were underwater on their mortgage in, position of losing their home. lisa discovered before he disappeared, gaffer inhad been taking money from his retirement account and recklessly blowing