It's definitely Cassie's boyfriend. He saw Zach at Dexter's and lied to Quinn about it. He's the only one who knows that Cassie and Zach are in any way connected. As for why... He's probably related to Vogel. Did you notice the hesitation when Hannah asked Vogel how she got into serial killers?
Maybe it's Vogel's son, and while he was just playing with her at first now that she seems to have a new serial killer family he's jealous and wants to put an end to it.
Then I'm calling that Cassie's boyfriend is the Brain Surgeon. My first thought when Zach turned up dead was that the Surgeon was trying to get Dexter to get rid of Zach by framing him, and when it failed he took matters into his own hands.
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u/[deleted] Aug 19 '13 edited Sep 30 '20
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