'EastEnders' Heather exit trailer released - watch
The Albert Square favourite, played by Cheryl Fergison since 2007, will be killed by Ben Mitchell (Joshua Pascoe) after a heated fight next Monday.
Being shown on BBC One from tonight onwards, the clip features heartbroken best friend Shirley Carter (Linda Henry) after hearing the devastating news.
Fiancé Andrew Carter (Ricky Grover) will initially be accused of the murder, while the real culprit is protected by his father Phil (Steve McFadden).
Actress Fergison recently admitted that bidding farewell to the soap was an "emotional" experience.