Heidi Costello (also Blissett) is a fictional character from the British Channel 4 soap opera Hollyoaks, played by Kim Tiddy. She made her first on-screen appearance on 20 July 2010 and made her final appearance in the series on 1 November 2011, after Heidi was accidentally murdered by her father, Silas Blissett (Jeff Rawle), in which he mistakes her for Lynsey Nolan (Karen Hassan). Character creation and casting On 12 April 2010, media entertainment website Digital Spy reported that a new family, the Costellos, would be introduced to Hollyoaks as part of the soap's ongoing rejuvenation. Former The Bill actress Kim Tiddy was cast in the role of ex-model Heidi Costello. Paul Opacic was cast as her husband, Carl and Rob Norbury, Miles Higson and Victoria Atkin were cast as her three children, Riley, Seth and Jasmine. Heidi was described as a "headstrong mother" and "more than able to hold her own". Of the castings, Hollyoaks series producer Paul Marquess stated: "We can't wait for this huge new boost of energy exploding on screen. These exciting new characters join our fantastic core cast. Together they will ensure that 2010 will be a year to remember on Hollyoaks." Tiddy received the role without an audition having previously worked with Marquess on The Bill. She is three years younger than the character she is portraying. In October 2011, Tiddy confirmed to Inside Soap that she was leaving Hollyoaks. Of her departure, she said "I've got a great exit storyline, so that's something to look out for." Character development Characterisation Channel 5's soap opera reporting website Holy Soap describe Heidi as "glamorous and strong-minded". Kris Green of Digital Spy described her as "strong, glamorous and slightly insecure". Speaking of her character, Tiddy stated, "She's an extremely strong woman. She's got a lot of inner strength. She's completely in love with her husband and loyal to her family." Storylines Heidi first appears in Hollyoaks when she views The Dog in the Pond public house with husband Carl. Heidi, Carl and sons Riley and Seth move to Chester after Carl purchases The Dog in the Pond. Heidi fires barmaid Cheryl Brady (Bronagh Waugh) after she flirts with Carl. Heidi sees stepdaughter Jem (Helen Russell-Clark) and persuades her to talk to Carl. Heidi and Carl's daughter Jasmine returns from America and moves to Chester. When Heidi's cousin Mitzeee (Rachel Shenton) arrives they organise a charity fashion