Confusion about the end. (spoilers)
According to the real accounts, the couple died which is unlike what the movie portrayed. Both the male and female had done meth thus no need for speculation about whether the girl was cheating with her boyfriend's friend. Finally, no female cop or any cop was stabbed. I suspect the writers wanted to add something different to make it more interesting. I found the article on ABCNEWS.COM/primetimestories. I cannot cut and paste the link from my phone.
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