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He states in his post that the shocking death of actor Philip Seymour Hoffman from an apparent drug overdose prompted him to open up. When Bree sees Andrew kissing Justin outside her window, she forbids him to bring his boyfriend round again. I was really nervous about that, I didn't want to do it.
Set just weeks after Rex's death, Andrew's first opening shot in Season 2 is to claim Bree is incapable of having murdered his father because "it takes guts to kill somebody".