Karen Read's '20/20' special airs Friday. Here's what we know so far.
Briefly

ABC's "20/20" is set to feature exclusive footage and a personal interview with Karen Read, who is accused of murdering Boston Police Officer John O'Keefe.
Read maintains her innocence despite accusations of deliberately backing her SUV into her boyfriend, claiming that others conspired to frame her for his death.
In a trailer for the upcoming special, Read acknowledges her anger towards O'Keefe that night but insists she did not kill him.
The case has attracted significant media coverage and public interest as Read prepares for her retrial after the first trial ended in a mistrial.
Read at Boston.com
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