Catherine suffered serious physical injuries in an automobile accident and became acutely depressed as a result. One morning, she received a check for $17,400 in settlement of her claims arising out of the accident. She endorsed the check and placed it on the kitchen table. She then called Robert, her longtime roommate, to tell him the check had arrived. That afternoon, she was found dead in the apartment. The police found the check and a note from her, stating that she was giving it to Robert. Had Catherine negotiated the check to Robert?