Ep 4. Kat McDonough and Seth Mazzaglia

In season 5 episode 4 of Killer Couples, the focus is on the case of Kat McDonough and Seth Mazzaglia. The couple seemed to have a normal relationship until they involved themselves in the murder of a young woman named Elizabeth Marriott.

Kat McDonough and Seth Mazzaglia's relationship started like any other. They met while attending the same job training and quickly hit it off. Both shared an interest in bondage and submission and explored it together. McDonough, who was in a relationship with another man at the time, soon broke up with him and moved in with Mazzaglia.

The couple's BDSM sessions became more intense when they began inviting additional people into their bedroom. However, things turned dark when they decided to start recording their sessions. They created a website where they could upload the videos and offer them for sale. It was on this website that Elizabeth Marriott's life was claimed.

Marriott was a young student at the University of New Hampshire. She met McDonough at work and the two became friends. McDonough invited Marriott to their apartment to watch a movie with her and Mazzaglia. It isn't clear what exactly happened when Marriott got to the couple's home, but she was reportedly killed during an intense bondage session. Mazzaglia strangled Marriott to death. He then put her body in a suitcase and dumped it into a river. The body was never found.

After Marriott's disappearance, McDonough and Mazzaglia attempted to cover up the crime. They sent fake texts from Marriott's phone to make it seem as though she were still alive, and they also pretended to be worried about her disappearance. However, the police became suspicious of McDonough and brought her in for questioning. She eventually confessed to knowing about the murder but claimed that Mazzaglia was the one who actually committed it.

During the trial, McDonough was given a plea deal in exchange for her testimony against Mazzaglia. She claimed that he had planned the murder and that she was only present during the act itself. Mazzaglia, however, claimed that McDonough was the one who killed Marriott. He was found guilty of first-degree murder and received a life sentence in prison.

Killer Couples season 5 episode 4 delves into the disturbing story of Kat McDonough and Seth Mazzaglia. The episode explores how their interest in BDSM ultimately led to the murder of a young woman. It looks at how the couple attempted to hide their crime and how they turned on each other during the trial. The episode also gives insight into the lives of the individuals involved and explores the psychology behind their actions.