Derek Hough has been keeping a bedside vigil as Cheryl Cole battles malaria, with the ‘Dancing with the Stars’ winner’s stepfather telling The Sun he’s feeling it is his fault the Girls Aloud star has the deadly illness. “Derek feels guilty. He is very distressed about all this,” Aaron Nelson, 54, explained. “He feels he has done this to her. He rang his mom yesterday in tears.” Watch a report from ITN below.