A DISGRACED surgeon was warned yesterday that he faces jail after he admitted killing a woman during an operation. Steven Walker, 47, a consultant, dramatically changed his plea to guilty during the fifth week of his Old Bailey trial for manslaughter. Judge Sir Stephen Mitchell remanded him on bail for sentencing on Wednesday. But he said Walker should not "misinterpret" the move. Sir Stephen said: "The options are open. There is no indication whatsoever of there being a non-custodial sentence." Sir Stephen said Walker had pleaded guilty on the basis that "a difficult operation became an even more hazardous one"...