Nadia Marcinko, who was Jeffrey Epstein's main girlfriend for seven years and later served as an assistant pilot for his private plane, may soon face scrutiny from U.S. legislators. Marcinko was one of four women named in a 2008 plea deal that granted them immunity from prosecution in exchange for cooperation.

This development comes as two other women, Epstein's former assistants Sarah Kellen and Lesley Groff, are set to be questioned by U.S. lawmakers. One congresswoman has called for all four women, including Marcinko and Adriana Ross, to be investigated, despite the existing immunity agreements.

Marcinko has never been formally accused or charged with any crime. Her legal representatives maintain that she is a victim of Epstein's abuse. However, accusers in Palm Beach, Florida, who were victims of Epstein's sexual abuse as minors, have provided testimony to police alleging Marcinko's participation in that abuse.

Extensive research by the BBC, including interviews with individuals who knew Marcinko and a review of emails exchanged between her and Epstein, aims to shed light on her role in the disgraced financier's life. These communications suggest a desire between Marcinko and Epstein to start a family together.

Furthermore, evidence indicates that Epstein repeatedly asked Marcinko to recruit other women to satisfy his sexual desires, a request she reportedly complied with over many years. The emails also highlight Epstein's coercive behavior, with Marcinko later telling investigators about incidents of physical violence, including being choked and thrown down stairs.

This account of alleged abuse by Epstein was revealed in a heavily redacted document released by the U.S. Department of Justice in January. While Marcinko's name is not explicitly stated, the testimony details align with information gathered from other sources about her.

The BBC reached out to Marcinko for comment, but she did not respond. Epstein died in prison in 2019 while awaiting trial on federal sex-trafficking charges.

The potential questioning of Marcinko, despite her plea deal immunity, underscores the ongoing efforts by authorities and legislators to fully understand the scope of Epstein's operations and the roles played by those close to him.