The girlfriend of late Dallas Cowboys defensive end Marshawn Kneeland broke her silence after the NFL star's sudden death. "I'm grieving hard right now," Catalina Mancera told the Daily Mail on Monday, November 10. "It will be a long time before I'll feel ready to talk at any length." Mancera, 22, called the police the night before Kneeland's death on the morning of Thursday, November 6. She expressed concern over Kneeland's well-being, telling authorities her boyfriend had "a history of mental illness.