When we think of relationships that become so heated and fraught they end in murder, we tend to think of romantic relationships. This is natural, since for most of us, these are the relationships that evoke the most extreme and memorable emotional responses, both positive and negative. There's a reason the biggest, sappiest power ballads are inevitably about the ups and downs of romantic love rather than, say, climate change or fly fishing.

But Faith Jenkins notes that intense, unhealthy power dynamics can infect other kinds of relationships as well, and while the 2nd season of "Killer Relationship" will continue to examine romantic relationships gone bad, it will also feature cases of platonic relationships that devolved into murder. "Because we've expanded 'Killer Relationship,' it's not just romantic relationships this season," Jenkins said. "What makes people have these love relationships that start out so great and end with someone having to die? We answer that question this season."

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