Witness Sophie Turner’s much changed look in the finale sneak peek of ‘The Staircase’

Margaret Ratliff (Sophie Turner) attempts to lighten the mood with some encouraging words the night before her father Michael Peterson's (Colin Firth) retrial hearing for the murder of his wife Kathleen Peterson (Toni Collette) in an exclusive clip from the finale of HBO Max's The Staircase. Sophie and Michael dated for roughly 13 years from 2004 to 2017. Their relationship, which is chronicled in the series, began while Michael was in prison after being found guilty in his wife Kathleen's murder in 2003. In 2011, Peterson was released from prison and granted a new trial after the judge ruled a prosecution witness gave misleading testimony. In the penultimate episode of the series, Sophie is seen urging Michael to take an Alford plea – for which a defendant claims their innocence but acknowledges there's enough evidence for a jury to convict – which he eventually does. Michael's case rose to prominence with a 2004 documentary series about his case, on which Sophie worked as an editor. The Staircase also stars Parker Posey, Michael Stuhlbarg and Rosemarie DeWitt.