Diagnosis Murder A Twist of the Knife (1993)

Dr Sloan suspects that his flame of long ago famous heart surgeon Dr Rachel Walters has murdered US Senator Cabot on the occasion of a guest operation at the community hospital After a long investigation Sloan and fellow detectives Dr Bentley and Dr Parker discover her motive Years ago Cabot had caused a hitandrun accident that put her daughter into coma But how did Dr Walters manage to pass the deadly bacteria on to the senator in front of TV cameras