Well, the wait is over and all will be revealed on Thursday 19 February – the show's 30th anniversary – followed by a special live episode the next day as the killer faces up to their crime.
So, who did the deed? We asked our 'Enders experts at sister mag Inside Soap to weigh up the odds…
2/1 Max Branning
He was secretly bedding Lucy before she dumped him for Lee Carter.
Max has destroyed A LOT of evidence, including footage of an argument with Lucy – and traces of her blood following a scuffle at the car park.
3/1 Cindy Williams
Cindy was jealous that Lucy was Ian's 'favourite' and told him about her cocaine use.
Cindy outed Ian for giving the police a false alibi – and freaked at the reappearance of Lucy's jewellery box, which played the last tune she'd ever hear…
3/1 Ian Beale
They had a terrible argument after Ian discovered Lucy had been taking drugs.
Already lied to police about his alibi, covering up the fact he met with prostitute Rainie Cross. But what else has he lied about?
4/1 Abi Branning
Lucy was having a scandalous affair with Abi's father Max – evidence of which she caught on camera. Ooh!
She shares a secret with her dad about the night of Lucy's murder – but what? She also stalked her sister Lauren.
4/1 Jay Brown
A robbery gone wrong? It wouldn't be the first time Jay's mugged Lucy for her phone. He did it before in 2009…
CCTV footage captured Jay taking the same bus journey as Lucy, and he later destroyed the hat he was wearing that night.
5/1 Jane Beale
A few years back, Lucy inadvertently robbed Jane of the chance to be a mother – twice. A long time ago, but still…
After Denise unearthed Lucy's belongings, Jane chose to hide them under the floorboards in the Beale house. Why?
6/1 Peter Beale
Peter overheard Ian telling Lucy that she was the twin he was most proud of. Ow.
It emerged that angel-faced Peter sells more than just fruit and veg, when he was forced to admit that he was the one supplying Lucy with cocaine…
10/1 Ben Mitchell
Unknown, but he's accidentally killed in a fit of rage before. #RIPHeatherTrott
Along with Jay, Ben buried Lucy's purse and phone after 'finding them in the street'. A likely story from a fella who is desperate to avoid going back to prison…
20/1 Denise Fox
It's pretty weak… Ian and Denise planned to visit her daughter Libby in Oxford, but a row with Lucy stopped Ian going.
Since Lucy's death, Denise has been drinking heavily and has admitted to lashing out at poorly Patrick. Is she feeling guilty?
30/1 Whitney Dean
Lucy was bullying Whitney, and the girls fell out over Mr Lover Man, Lee Carter.
Whit deleted some online chats that she'd shared with Lucy over social media. And she left a note at Lucy's funeral reading, 'ROT IN HELL'.