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.