Sarah Platt (Tina O'Brien) has made a bold admission in tonight's (24 July) episode of Coronation Street. The reality has unravelled over recent weeks, with Sarah finally arrested and then charged with murder. Michelle Tate as DI McLaughlin and Tina O'Brien as Sarah Platt. Sarah knew that the time had come to finally confess to the murder, despite previous insistence that she had no involvement. Tina O'Brien as Sarah Platt and Samia Longchambon as Maria Connor.