Its a pretty long shortlist of suspects... if it ends up being somebody else I didnt include in the poll...
My top 5 suspects atm:
1. Lee Carter
The Carters are a new family to the square. I think theyre being built up to be the new 'Mitchells' and so need something massive to happen surrounding them. We know Lee is a little unstable atm and I reckon theres a chance were gonna be fooled into liking him and feeling sorry for any accusations going his way.
2. Cindy Williams
With Lucy Beale out the picture Cindy could well fill her 'space' in the Beale family... Ian/Peter/Jane could grow to love her like they loved Lucy until the shocking revealment. If it is Cindy I would guess it is an accidental murder or perhaps acting on impulse.
3. Charlie Cotton
Is he Dot's grandson? Probably not. Seems dodgy and a pretty good call for it. He could easily try to seduce Lucy, and failing that (because she is into Lee), he lashes out and murders her. Maybe hes done it before?
4. Whitney Dean
Whitney likes Lee.
Lucy likes Lee.
Lee probably likes Lucy more than Whitney.
Lucy's been a bitch to Whitney recently.
Impulse murder? Dunno. Shes not been involved in too much lately...
5. Nick Cotton
I dont think hes dead. And if Nick Cotton isnt dead... its every chance it could be him. It could be a double-wammy revealment: Lucy's murderer and Nick's alive.