Sydney Marshall

Sydney Marshall is the main villainess from 2013's The Preacher's Mistress (alternately titled, A Woman Betrayed).

She was played by Natalia Cigliuti.

Backstory
Sydney Marshall is the sister of Jake Marshall, a married man who engaged in an illicit affair with Gwen Griffith (the main protagonist). After Jake was killed in a car accident following leaving his wife, Sydney vowed revenge on Gwen, blaming her for Jake's death. Four years after her brother's death, Sydney became involved with Ed Baker, a married preacher who was looking to get out of his marriage to Kelly, Before the relationship, Sydney found Gwen and moved into her home, where she lived with her son (and Sydney's nephew), Alec--all the while posing as Gwen's best friend to keep her villainous plans (and her true identity as Jake's sister) hidden.

Events
Sydney enlisted Ed to pose as Gwen's lover as part of their plan to eliminate Kelly and frame Gwen. Kelly suspected Ed was cheating on her, and later captured a photo proving her suspicions. Later on, the evil Sydney appeared at the Baker household and killed Kelly in her garage, doing so by stabbing her to death. As planned, Gwen was set up and implicated in the murder, due to the fact that she and Ed were dating. With the trial proceedings taking longer than the villains expected, Sydney changed her game plan and later drugged Gwen's wine, while also revealing that she is Jake's sister and her revenge plot. After Gwen passed out, Sydney placed her in the trunk of her car and met Ed to explain that they have to kill Gwen due to the fact that she knows who Sydney really is. At that moment, David Wyatt, a cop, held the duo at gunpoint while freeing Gwen--only to engaged in a tussle with Ed while Sydney retrieved Wyatt's gun. She shot Wyatt (non-fatally) and then went after Gwen, who killed Ed with a knife. Gwen later stabbed and wounded the vengeful villainess and held her at bay until police arrived and arrested Sydney.