Defense lawyers in the murder trial of celebrity broker Linda Stein have drawn attention to new blood evidence that they say shows a man was the killer, not personal assistant Natavia Lowery, who police say confessed. The defense says DNA evidence exists for unknown “Male A.” “The real killer is a man, he’s out there and we have his DNA profile,” Manhattan attorney Ronald Kuby said. A report prepared by the medical examiner’s office found that blood from a man as well as Stein was found on her bathroom sink. Manhattan district attorney spokeswoman Barbara Thompson dismissed the blood as “a tiny speck.”