Something I read earlier:
It was Bobby Beale, and Jane's covering for him, because Lucy was killed at home.
Following the discovery that Lucy kept a stash of cocaine in her jewellery box, Jane flipped out.
She flipped out even more when, later that night, she discovered that little Bobby had got his hands on Lucy’s drugs.
After catching Lucy having sex with Lee earlier that day, Jane sent Lucy a text saying she needed to talk to her.
Jane thought Lucy was going off the rails and her intention was to talk some sense into her.
After bringing a drunken Jake back to Albert Square, where Lucy was heading anyway after receiving a concerned text from Jane, Lucy decided to pop home for a quick pick me up before she went to Roxy’s party.
Lucy wound Jane up by laughing at her and saying that Bobby wasn’t even her real son and she was just a barren old woman.
When she got to her room, Bobby was in there going through her jewellery box. He'd heard Jane and Ian going on about the jewellery box and wanted to know what was in there.
A scuffle broke out as Lucy tried to snatch it back from her brother. During the fight, Bobby pushed Lucy over, she dropped the music box, banged her head and died, as a result of the previous head injury she received at the car lot.
Jane walked in and saw what had happened and went into Protection Mum mode.
First of all, in a panic, Jane ran outside looking for help. She ran into Max who was out walking Tramp the Dog. Max saw she was upset and Jane blurted out what had happened and that she didn’t know what to do.
Max convinced her that if they moved the body and planted it on the common, they could make it look like a mugging. He suggested they dump her bag somewhere and to make it look more realistic.
That’s when Jay and Ben found it and took the purse and wallet.
They put Lucy's body in the back of Jane's car. Abi came looking for Max and Tramp and saw what was going on. She didn’t question Max about it until later though, this would explain Max’s comment about no one finding out about what happened on Good Friday.
That’s when Jane's behaviour started to become very suspicious.
It would also explain Emma's "you knew" comment to Max, as he drove her to hospital after the car crash. And it would explain why Emma texted "I can’t keep THE secret" rather than YOUR secret to the killer. And why she said "yes, but it’s still murder" when she met JANE in the park. Jane was trying to justify her actions saying it was an accident.
This explains why Emma said she can't keep the secret, because Jane came along to meet her with Bobby, that's why she asked the "hut" to stay open, because she was meeting a child. OR she wNted to know someone was there as after all, it was a killer she was meeting, and needed security/witness if anything was to happen. This also explains why Bobby knew exactly where Lucy was found.
Emma knew the killer drinks tea as she bought one for the killer when they met at the park. How many cups of tea had she shared with Jane while working as the family liaison officer and comforting the family?
Jane gave Lauren that weird alibi when Emma was given the footage from Fatboy's phone, but Jane and Bobby were suppose to be in Birmingham that night. Emma realised when Dean came into the pub and said Patrick had fell and had only left him for 5 minutes, Jane said the exact same thing when Bobby disappeared. Was she providing an alibi for Lauren? Or for herself? Or was she telling the truth, but lying about where she was? If she were inside the Masood's as she claims, she wouldn't have been able to see if Lauren had gone into the Beale house or not.
Everything else is the same. After having sex with Ian, Jane whisked Bobby off quickly to get her car cleaned so none of Lucy's DNA was in it, and to get Bobby out of Walford before he started coming unstuck in front of the police.
Jane didn't want to go to the funeral because she couldn’t bear to see Ian grieving over Lucy, when she knew what had happened. She turned up in the end but still managed to avoid it when she comforted Ian who had just found out that Lucy had been sleeping with Max.
She was still the first person to look at Lucy's phone after Ian had charged it up, which enabled her to delete the text that she sent asking to see Lucy.
And remember how she took on Phil Mitchell to keep the phone and purse? Who takes on Phil Mitchell? Maybe someone whose fingerprints and DNA are all over the stuff from when she took it off Lucy and dumped it, making it look like she was mugged. And then she hid them under the floorboard in the Beale house, rather than giving them to the police.
The fact that the actor who plays Bobby has changed too has made me think that this is because he's about to get a big storyline. And, remember one of the clues was the music box being the last thing Lucy heard. The open music box on the floor was the last thing Lucy heard as she died.
Also, there is the small matter of Lauren discovering Emma's file and recognising the number written down. The landline number of her best friend and childhood sweetheart would be a number she'd know by sight, after all. And she's acting all weird about going to the Beale house at the moment, but doesn't actually seem a bit scared by Peter. Which suggests that it's someone ELSE in the house.
Case closed. Bobby killed Lucy, Jane and Max dumped the body in the woods to cover it up. Abi caught them in the act so she knows as well.