graham macdonald was not on the go train. er): police started to wonder if graham might have had a reason to want carmela dead. did you think that maybe graham macdonald had some type of an obsession with carmela, that possibly when he was doing renovations, he got fixated on her? definitely. the way his story wasn't panning out, and if he had some type of relationship with her, and it didn't go well. - that's right. - what we're doing-- andrea canning (voiceover): after talking to friends and family, the scorned-lover theory didn't go anywhere. sit in here, graham. do you want to take the seat here? andrea canning (voiceover): but after catching him in those lies, they needed to talk to graham again. so they called him back for a second interview. graham maintained he was in toronto that day, but his memory of it was hazy. and there was a good reason for that. he was using drugs that day. and his recollection's all over the map and jumbled because of that. he doesn't really remember where he was. andrea canning (voiceover): w