Rosalind Dyer was a serial killer who went by the name of the "Cobra Killer". She was also the archnemesis of Nick Armstrong, the officer who had her convicted of murder. She initially assisted the LAPD in uncovering a series of murders. Eventually, she is broken out of prison by La Fiera and assists her in abducting Angela Lopez at her wedding, before getting killed by her nemesis, John Nolan. Despite her death, her actions continue to influence other serial killers, such as her former lover, Mark Emmerson. (Recurring; Seasons 2-3, Season 4 & 6 (flashbacks))
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