Next month, EastEnders will celebrate their 30th anniversary where Lucy's murderer will finally be revealed after a gripping nine-month whodunnit storyline.
Lucy, played by Hetti Bywater, makes a chilling return in the trailer as the Walford residents – and potential suspects – witness strange movements in the Square.
The teaser shows a swing moving by itself, handprints on the chip shop window and Lucy floating above the square.
Lucy's father Ian, her twin Peter and stepmother Jane are all suspects, as well as the likes of Denise Fox, Ben Mitchell, Jay Brown, Max Branning and sisters Lauren and Abi Branning.
The teaser gives soap fans a taster of what to expect in what will be a week of revelations and surprise appearances.
What do we know so far about EastEnders' live week?
Live week kicks off on Monday 16 February and EastEnders will air a special 30-minute live episode, while all other episodes will feature live elements.
Viewers will see the return of Jo Joyner as Tanya Branning, John Partridge as Christian Clarke, and soap legend Barbara Windsor as Peggy Mitchell.
Elsewhere, Hetti, Jamie Lomas and Tanya Franks will reprise their roles for a special flashback episode., which will reveal Lucy's final moments before her death.
Comedian Richard Blackwood will also make his debut during the live episode as Walford's new villain.
To mark the 30th anniversary, soap icons Barbara and Pam St. Clement will be reliving the soap's most memorable storylines as part of EastEnders: Back to Ours, which will be shown exclusively on BBC iPlayer.
Other actors taking part in Back to Ours, which kicks off on 27 January, include Adam Woodyatt and Laurie Brett, Shane Richie and Jessie Wallace, Nitin Ganatra and Himesh Patel, Rita Simons and Samantha Womack, and Diane Parish, Tameka Empson and Rudolph Walker.
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