Marie was devastated by her daughter's death, and enraged at her brother for not only failing to see the storm approaching and warn the public, but for not saving Colette's life during the storm (as she had sent Colette to her uncle's house to be safe during the hurricane). The final straw came when Clifford failed to attend Colette's memorial service, driving Marie to kill her brother in a fit of rage, slashing his throat with a weed whacker. The vengeful Marie additionally painted a French saying for "revenge is a dish best served cold" in Clifford's blood on his poncho.
When the player and detective Amy Young began investigating Clifford's death, Marie initially hid her relation to Clifford from them before they discovered her status as his sister, at which point Marie made no secret of her resentment of her brother's callous actions. Ultimately, the evidence (which included hairs Marie left on the paintbrush) pointed to Marie as Clifford's murderer and she was brought in for interrogation. After initally denying the claims, Marie confessed to killing Clifford, stating that her brother deserved to die for his role in Colette's death and that now that he was dead, the victims of Hurrican Yves could have retribution. Marie was arrested and ultimately sentenced to ten years in prison, with the possibility of parole in five.
- (Amy Young: "We know you killed Clifford. Don't you feel any guilt at all for what you did?") Guilt? Is it a crime to remove a weed that is hurting all around him? Thanks to me, finally those who have been grieving can feel some retribution! (Amy Young: "But he was your brother! How could you do that to your family?") He is not family. Family is about love, and family would never leave a young girl unprotected during the storm. That's the opposite of love." (Marie's confession to killing her brother)