Dennison 'Denny' Duquette Jr

A patient waiting for a heart transplant. He developed a close relationship with Izzie Stevens, and he eventually proposed to her. Izzie risked her career to save him by cutting his LVAD wire, insuring that he would become so ill that he would get a new heart. He died shortly after the transplant from a blood clot. He reappared in Season 3 as part of Meredith's dream after drowning. In Season 5 Izzie began to see Denny everywhere, which was eventually revealed to be a symptom of her brain tumor.