About Best Crime: About Dexter - Harry's death, Did Vogel kill Harry??

There was a moment, after the director has shown those flashbacks of Matthews, who revealed the truth about Dexter's father that I thought, "But if it was Vogel to kill Harry?"

Yes, but we assume. There are some things that led me to talk about it; think for a moment when asked Debra videos to Vogel. The psychiatrist hides some videos, which means that Vogel has something to hide their children Morgan, and then.. In one of the latest videos Harry says: "Don't think I can live with this burden."
So believe that Harry committed suicide could be a risky proposition.

When Harry says that he did not want to live with that weight, I believed that he was going to confess to the police about what he and Vogel were doing, remember that Harry is an arrogant man, when he adopted Dexter was aware that he could become a sociopath and a disturbed, but went straight to his way.

Another consideration... when the police decide to commit suicide usually decides to shoot himself, hardly a cop with a beautiful career, decide to use poisons to get it over with. It seems to me a technique that would use much more a woman, as Vogel.

Only I have thought about this theory?
All the pieces back in their place, and let's be clear, a psychiatrist who wants to convince a serial killer to "convert" to another on the same principles, is a woman capable of murder.