Joanna Yeates: Timeline

Friday 17 December: She has a drink with colleagues before walking home, stopping to pick up a pizza on the way.

Sunday 19: Miss Yeates is reported missing by her boyfriend Greg Reardon, pictured right, when he returns after a weekend visiting family in Sheffield.

Tuesday 21: Her parents make an emotional appeal. Her mother, Teresa, says: "Jo, we love you dearly and are desperate to know that you are safe and well."

Wednesday 22: Mr Reardon says: "I desperately want her back - I thought we would be together forever."

Friday 24: Police release new CCTV footage showing her buying the pizza.

Christmas Day: Dog walkers find a body three miles from where she went missing.

Sunday 26: Police announce they are "satisfied" the body is that of Miss Yeates.

Monday 27: Her family lay flowers at the spot where her body was found.

Tuesday 28: Police reveal she was strangled..

Thursday 30: Police arrest her landlord Chris Jefferies.

New Year's Day: Mr Jefferies is released on police bail.

Monday 3 January: Police say they have no evidence Miss Yeates was sexually assaulted.

Tuesday 4: Detectives launch a national campaign on Facebook.

Wednesday 5 : Police investigate whether she was strangled with her ski sock.

Friday 7: Officers talk to more than 200 people as they retrace Miss Yeates's last steps.

Tuesday 18: Mr and Mrs Yeates, left, say their daughter probably knew her killer. An actress reconstructs Joanna's final steps and is filmed for the BBC programme Crimewatch, left

Wednesday 19: The Crimewatch appeal attracts 300 calls from the public.

Thursday 20: A 32-year-old man is arrested on suspicion of murder.