Anne Foster Anne Foster was Frank Foster ' s mother and killer . Anne arrived in Weatherfield in September 2011 from France with her husband Sam to meet Carla Connor , who was currently engaged to Frank . Tension arose when Carla got drunk in Nick ' s Bistro and left after arguing with Anne . Anne and Sam visited Carla in hospital after she ran down Stella Price and crashed her car into Barlow ' s Bookies . Anne and Sam were invited to the wedding later that month , but Frank called them when Carla called off the wedding . They later appeared at Frank ' s court case when he allegedly raped Carla . When Frank was denied bail and his case postponed , Anne lunged at Carla when she dubbed Frank a rapist , but Sam held her back . Frank ' s appeal for bail was granted in October 2011 , and he was released . He appointed Anne as proxy at Underworld , much to Carla ' s horror . When Carla overreacted after a client flirted with her , the business lost out on a big order . In retaliation , Anne hired removal men to take 49 % of the materials and machines from the factory , as Frank owned part of the business . Following this , Carla plucked up the courage to confront Frank , but Anne threw her and Maria out of his house . After taking a large portion of the factory , Anne helped Frank set up his faction of the business by persuading Sally Webster , a longstanding seamstress at Underworld who had been one of the workers made redundant by Carla due to the loss of material , to work as supervisor . Anne and Sally later turned up at Underworld after a box of silk which was intended for Foster ' s was accidentally delivered to Carla . Carla and Michelle claimed that no such silk had been delivered to them , although later in the Rovers they played a prank on Anne and Sally by wearing the silk , leaving them furious . Anne began to realise how the stress of Frank ' s upcoming trial was getting to him . She made Carla a proposition : drop the charges and Frank would stop running his business and she would never hear from him again . Carla angrily threw her out of her flat . Sam died in January 2012 of a heart attack , while he and Anne were abroad on holiday . Anne blamed the stress of Carla ' s " lies " for his death and went storming round to Underworld , berating her . Anne then stood by Frank at his trial , at which he was acquitted of all charges . Anne then wanted to press charges against Carla but Frank decided not to pursue the matter further , although as neither Frank nor Carla were willing to sell their share of the factory , they worked alongside each other at Underworld . Anne ' s support for Frank wavered when she found out he was having an affair behind Sally ' s back with Jenny Sumner . Anne urged Frank to come clean with Sally but Frank threatened to throw her out if she kept sticking her oar in . Anne broke the news to Sally anyway , nearly scuppering a deal between Frank and Carla in which Carla was selling her share of the factory to Frank and setting up on her own with a big order from Jenny . When Sally found out about the deal , she realised Carla was being conned into selling her share for a fraction of its worth , but she was too late to warn as she had already signed the contract . Later that day , Anne overheard an exchange between Frank and Carla in which Frank gloated about defeating her and raping her . Frank ' s admission of rape startled Anne and once alone with Frank she confronted him , accusing him of as good as killing Sam , but Frank was no less derisive towards Anne than to Carla . In a heated moment , Anne grabbed a nearby bottle of whisky and hit Frank over the head , killing him instantly . The police investigation into Frank ' s death was mainly focused on Carla and Peter Barlow . Anne hadn ' t meant to kill Frank and doing so had broken her , but her odd behaviour in the weeks after his death was passed off by everyone as grief . Sally felt sorry for Anne having to cope on her own and supported her at the funeral , where she surprised Carla by coming over to her and apologising on Frank ' s behalf . A wake at Frank ' s house was planned but Anne cancelled it and left the funeral early . Worried that Anne was going to harm herself , Sally followed her to the house where she found Anne cradling Frank ' s watch , which had been missing from Frank ' s personal effects . Sally realised that Anne was killer and tried to run away but tripped and fell , knocking herself out . Anne was then visited by Carla , who wanted to know if she knew about the rape . Anne tried to bluff her but Carla found Sally ' s body and was about to call for an ambulance when Anne grabbed a knife and threatened her with it . Anne had a nervous breakdown in front of Carla as she confessed to everything . She dropped the knife when Kevin Webster surprised her from behind . She then made a full confession to the police and was taken into custody , while Sally was taken to hospital where she made a full recovery . List of appearances . 2011 2012