By Charlotte Tutton EastEnders scenes may have revealed what will lead to Denise Fox’s downfall on the BBC soap. A returning character got more than they bargained for on Tuesday night, resulting in Denise appearing to make a murder confession. Viewers saw the return of former villain Lucas Johnson yet again, as Denise’s killer ex-husband was the person she was left turning to. Denise visited him in prison in a recent episode, wanting to seek clarity on how she was feeling after the murder of Keanu Taylor. Denise and five other characters were at the scene of the crime of his demise on Christm…