Helgard 'Helli' Müller, a South African national, relocated to Paris where she rose to become managing director of Karin Models, a prominent modeling agency established by Jean-Luc Brunel in 1988. During her tenure in the late 1980s and 1990s, she oversaw operations but later distanced herself from Brunel after witnessing his abusive behavior toward young models. Müller has described scouting trips to Eastern Europe and South America where Brunel allegedly preyed on vulnerable teenagers as young as 12 or 13, coercing them into sexual acts and promising modeling careers that rarely materialized. In the years following her departure from the agency, she emerged as a significant whistleblower, providing detailed accounts to journalists and authorities about Brunel's predatory network, including his close ties to Jeffrey Epstein. She recounted instances of Brunel drugging and assaulting girls at the agency and facilitating their transport for exploitation. Her revelations, featured in outlets like the Daily Mail and French media in 2020-2022, corroborated survivor testimonies and contributed to heightened scrutiny of Brunel prior to his 2022 suicide in custody while awaiting trial for rape charges. Müller has emphasized her own victimization by association, having initially been charmed by Brunel's industry success before recognizing the extent of his crimes.