A 61-year-old woman with blood cancer developed a severe and unusual double fungal infection caused by two mold species while being treated for a known fungal infection. Despite receiving multiple antifungal medications, her condition worsened and she ultimately died from multiple organ failure. The case is important because it demonstrates how Trichoderma fungi are becoming dangerous pathogens in very sick, immunocompromised patients, and a new drug called olorofim showed promising activity against this infection in laboratory tests.