'You didn't do anything wrong': Ian Beale agrees to protect son Bobby and Jane's murderous secret in the finale of EastEnders Live Week

After a week of live episodes to celebrate the 30th anniversary of EastEnders, the 'Who Killed Lucy?' storyline came to an emotional end.

Bobby Beale was revealed as the killer on Thursday night, though Jane tried to take the blame for her murder when finally confronted by Ian.

But the tearful father realised his new wife was protecting his youngest son, and decided to protect their murderous secret anyway - as Bobby doesn't even realise he killed his sister.

Tragic truth: Ian Beale discovers his son Bobby killed Lucy in the finale of the EastEnders live week

Show boss Dominic Treadwell-Collins said: 'He thinks she got up and walked out the door, and that is what Jane has said to him.'

The producer said he initially had two other suspects in mind for the murder before deciding to put Bobby in the frame and added the idea had been partly inspired by the murder mystery novels of Agatha Christie.

He said: 'Three of Agatha Christie's best ones - one of them the detective did it, one of them everyone did it and one of them the narrator of the story did it. We always wanted those big twists.'

He said it was a conscious decision not to show the fight between the two characters to protect the young actor, Eliot Carrington, who plays Bobby.

Treadwell-Collins said: 'The fact Bobby didn't deliberately do it and it was an accident is very, very important. I wouldn't lumber a child with that.'

Cindy reads a letter with Lucy's final words on Eastenders

The episode opened with Jane (Laurie Brett) and Ian (Adam Woodyatt)  in the kitchen where he reveals how he knew Jane was hiding something. 

'When you stayed calm after Peter wanted to confront Denise. Everyone else was panicking but you stayed calm,' Ian tells her when she asks how he knew something was amiss.

'My little girl out on the common was it you? Are you covering for someone?'

'It was just me, only me,' Jane says before Ian flies into a rage and kicks her out of the kitchen. 

Protection: Ian will not go to the police about his son and Jane's murderous secret

Peter (Ben Hardy) finds his dad in their trashed kitchen, and eventually a crying Ian tells him Jane's revelation.

Jane then makes up a story of how she killed Lucy: 'It was a freak thing, the wrong angle, the wrong part of her head. I should have phoned the police. I didn't and I panicked.'

But Ian isn't convinced when Jane says she confessed to Emma Summerhayes (Anna Acton), who died from the injuries sustained after being hit by Roxie Mitchell's car.

'Why didn't Emma report it. She finally solves the case and does nothing to solve it,' Ian says. 'What aren't you telling me?'

Final words: Ian kissed the last letter of love written by Lucy on the night she died

Then it dawns on him: 'He called his mum. He did something bad and he phoned you for help.'

'The door was open, she was lying there,' Jane cries, 'I thought it was joke. I checked her breathing, there was nothing. He said she started it, but he didn't seem to know she was dead. He hit her with a box.'

'The jewellery box, he gave that to Beth for Christmas,' Cindy Williams (Mimi Keene) says shocked.

'He's a 10-year old boy, why did he do such a thing,' Ian laments.

Apology: Lucy's letter was away of saying sorry for the trouble she had caused her father

'He said he heard the arguing that night, he couldn't sleep. He said she was writing something, he wanted her to stop causing trouble. He picked up the box, she fell, he couldn't wake her, he said he tried all on his own and that's when he called me,' Jane cries. 

Peter still didn't understand why Jane tried to cover it up and Jane continues to play the loving mother card to justify her actions to protect her son.

Ian runs out the room to be sick when he hears that his wife put her into the boot of the car and carried her 'like a child' into the woods before laying her down and crying her sorrys to her dead step-daughter.

Maternal instinct: Jane said she wanted to protect her son that's why she disposed of Lucy's body in Walford Common

She continues to try and justify Bobby's actions: 'He was frustrated, he just wanted to make things better.'

Then Phil Mitchell (Steve McFadden) turns up to tell Ian about his mother Kathy (Gillian Taylforth) actually being alive but the distraught father frantically tells him to leave.

'Is everything alright?' Bobby says as he arrives home, unaware that he even killed Lucy with his actions.

Can't believe it: Peter doesn't want to continue the lie after finding out the truth about his twin sister's death

'If the truth comes out we're all going to get the blame,' Peter says.

Jane and Cindy both say they should keep quiet, while Ian goes up to speak to his son. Beale than tells Peter that they must continue to cover up the murder.

'I won't be part of it,' Peter says. 'Nine hours she was laying there in the cold. The only people you care about is Jane and Bobby.'