The Whodunnit? will finally be solved this month, almost a year after Lucy was murdered on Good Friday 2014, during a live episode.
But the killer won’t actually know they did it until 30 minutes before viewers, according to Jake Wood.
Jake, who plays Max Branning in the soap, said: “I don’t think we’ll find out until the night. I guess whoever did it will find out an hour or half an hour before so I have no idea.”
As viewers will know, Max and his daughters Lauren [Jacqueline Jossa] and Abi [Lorna Fitzgerald] are major suspects in the case.
Speaking on the Afternoon show on BBC Radio 2, Jake continued: “There’s a secret as well between [Max] and his daughter Abi but I don’t know what that secret is so hopefully I’ll find out in the next couple of weeks.
During an episode screened last year, a terrified Abi seemed relieved when Max split from investigating officer Emmer Summerhayes, telling her dad: “She can’t find out what you’ve done.”
Max replied: “Whatever happened on Good Friday stays between us – and only us. We’ll just have to be careful, won’t we.”
This, and the fact Jacqueline has already filmed her final scenes ahead of her maternity leave, suggests the Brannings are definitely involved in the murder in someway.
Jake and the rest of the cast are currently rehearsing for live week, which will celebrate the soap’s 30th anniversary, and the Strictly star admitted he feels ‘honoured’ to be involved.
“I’ve been there nine years, I love the show and there’s not a day goes by when I’m not thankful to be in it, especially now. It’s a real honour to be involved in the show for the 30th anniversary.”
Jacqueline Jossa's life in pictures: Eastenders, Dan Osborne and prison visits to her father
1 of 11Jacqueline Mary Jossa
Jacqueline Jossa has become one of EastEnders' most exciting stars. Following her announcement last week that she's expecting TOWIE star Dan Osborne's baby, we've rounded up everything you need to know about the talented actress.
2 of 11jac2
21-years-old, born 29 October 1992.
3 of 11jac3
She's originally from Bexley, London.
4 of 11jac4
Her first major acting job was as Lauren Branning on EastEnders, taking over from Madeline Duggan in 2010
5 of 11jac5
She is the cousin of former EastEnders actress Megan Jossa, who played Grant and Tiffany Mitchell's daughter Courtney.
6 of 11jac6
In 2012 Jacqueline's father John was jailed for four years after stealing almost £500,000 of taxpayers' money while working for Enfield council.
7 of 11jac7
She won Best Newcomer at the National Television Awards in 2012.
8 of 11jac8
For three years running, 2012, 2013 and 2014, Jacqueline has lost out on the Sexiest Female award at the British Soap Awards to Michelle Keegan.
9 of 11jac9
From 2011-2013 she dated her former EastEnders co-star Tony Discipline.
10 of 11jac10
In June 2014 she confirmed her relationship with The Only Way Is Essex star Dan Osborne, although they are believed to have been dating on and off for several months before this.
11 of 11jac11
She and Dan confirmed they are expecting their first child together in August 2014, saying they are both "thrilled".