Walford is stunned after news spreads that EastEnders matriarch Peggy Mitchell (Dame Barbara Windsor) has killed herself.
And no one is more devastated than her son Phil Mitchell (Steve McFadden).
At a difficult and emotional time, Phil's ex Sharon Watts (Letitia Dean) tries to provide a shoulder for him to cry on - but after so much bad feeling between them, will he accept her support?
This comes after Sharon cosied up to her other ex Grant Mitchell (Ross Kemp) in the run-up to Peggy's death, when he was struggling to come to terms with news of her terminal cancer.
Will it be Sharongate all over again?
The beloved Queen Vic landlady Peggy Mitchell said goodbye to Albert Square for the final time on Tuesday as she took her own life in a heartbreaking scene.
She took an overdose after breaking the news to son Grant that her cancer had returned and taken a "proper grip" on her, and taking Phil on a tour of their old haunts.
In a poignant final scene, after smelling cigarette smoke throughout the episode, Peggy hallucinated the return of her former love rival-turned-friend Pat Butcher (Pam St Clement), puffing away in thick pink lipstick and with "earrings rattling like Marley's bleeding chains".
Speaking to her friend, who passed away in the soap from cancer in 2012, Peggy said: "I'm being eaten alive and it hurts and I can't wait.
"I don't want that to be me, I don't want to be that little old lady in the bed, with people saying, 'Remember her? Peggy Mitchell? She's all skin and bones'."
She continued: "I will go as I have lived: straight back, head high, like a queen."
The ghost Pat remained with Peggy as she took a handful of pills alone, with the camera panning over letters left to her children before a clock stopped to indicate the end of the Square's most vivacious, loved and enduring residents.
This episode airs tonight at 7.30pm on BBC One.