WaPo Duisburg S04E04 - Klassenkampf

The WaPo investigates the murder of Rasmus Lorenzen, whose body is found on the banks of the Rhine. He was apparently killed in his villa and then disposed of in the Rhine. Nadine finds a threatening letter that leads the WaPo to the victim's housekeeper, Isabel Martinez. Rasmus apparently also exploited his position of power in relation to his service providers and made Isabel work for him for free under a pretext. Did she finally make good on her threat and kill Rasmus in a fit of rage?