The longtime partner of Jocelyn Wildenstein, who was nicknamed “Catwoman” for her feline-like plastic surgery, has revealed that she died in her sleep while suffering from a painful condition that gave her swollen legs.

Jocelyn Wildenstein’s longtime partner, Lloyd Klein, has revealed the likely cause of her death at age 84. Klein told People that Wildenstein died peacefully in her sleep after battling phlebitis, which the Cleveland Clinic describes as inflammation of the veins near your skin due to blood clots.