her, Katie leaves for a while and gets engaged to Robert on her return. Katie gets a job working as a personal assistant for the King family. However, unbeknownst to Katie, Robert has an affair with Sadie King (Patsy Kensit). Cain finds out and tells Andy, who tells Katie. When she does not believe him, he attacks Robert and tries to force him to tell the truth but Robert insists that Andy is lying. However, Katie learns the truth when she finds text messages from Sadie on Robert's phone. Heartbroken, Katie ends their relationship and throws a drink over Sadie in the pub. Donna also forgives Katie and they repair their friendship, united by their hatred of Robert. Katie then has a one-night stand with Andy, after discussing their marriage and Andy suggests reconciling but Katie refuses, choosing instead to join her father, and they part on good terms. Katie says goodbye to Donna and Robert begs her to stay but she leaves with Cain's sister Chas (Lucy Pargeter). In February 2006, Katie and Brian are involved in a car accident and the police inform Andy as he is her next of kin. Brian is killed but Katie survives and she stays with Andy until she recovers. Her mother, Caroline, tries to convince Katie to move to Greece but she decides to give her marriage another go. Angry with Katie about the way she treated Andy in the past, Daz is unhappy with Andy and Katie's reconciliation and tries to convince Andy that she will be unfaithful again, even trying to seduce her himself. Sadly, they are seen by lodger Jo Stiles (Roxanne Pallett), who blackmails Katie and begins an affair with Andy. Katie struggles to cope with looking after Andy's daughter, Sarah, and Katie later thinks she is pregnant but it is a false alarm. Andy eventually tells Katie about his affair with Jo and she throws them out but she has to move out as Andy holds the lease. Katie later sleeps with David Metcalfe (Matthew Wolfenden) which ends his relationship with Del Dingle (Hayley Tamaddon). In April 2007, Andy and Katie separate. Katie goes into business with Perdita Hyde-Sinclair (Georgia Slowe) and develops feelings for Perdita's husband, Grayson Sinclair (Christopher Villiers). Grayson's mother, Rosemary King (Linda Thorson), is delighted and encourages Katie, hoping for grandchildren as Perdita can't have children. Katie offers to be a surrogate mother