Jurors in the murder trial of Karen Read began deliberating Friday after weeks of testimony in a highly divisive case in which the prosecution’s theory of jaded love turned deadly is countered by a defense claim that a cast of tight-knit Boston area law enforcement killed a fellow police officer.

For weeks, all appearances were that prosecutors would call witnesses as part of a brief rebuttal case in the Karen Read retrial, giving them the opportunity to get the last word after damaging testimony from expert witnesses for the defense.

Karen Read’s defense is set to call its first witness on Friday, marking a new phase in her retrial in the killing of John O’Keefe, her off-duty Boston police officer boyfriend whose body was found buried in the snow outside a home in Canton,

Karen Read tells reporters she didn't notice tensions between John O'Keefe and Brian Higgins at the Waterfall Bar and Grille shortly before O'Keefe's death.

(CNN) — Karen Read’s defense called its first witness on Friday ... paint a picture of a flawed and biased investigation – a strategy they have so far echoed in the retrial.