Joanna Yeates: Pizza riddle in the last picture - Mirror.co.uk

This is the last image of Joanna Yeates - clutching a £4.50 pizza which could hold the key to solving her disappearance.

Joanna, 25, was caught on CCTV buying the pizza from a Tesco Express store at 8.37pm the night she went missing - just 250 yards from the home she shared with her boyfriend Greg.

The landscape a r c h i t e c t w a s pictured using a selfservice checkout. She was wearing a cream-coloured coat and carrying a bag which were later left behind at her flat, along with her purse, keys and mobile phone.

Bizarrely, although the receipt for the Tesco Finest Margherita Pizza was also found inside her rented ground-floor apartment in Clifton, Bristol, there was no sign of the pizza or the wrapping.

There were no signs of a forced entry or a struggle inside the flat.

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As police pathologists last night carried out tests to identify a body found yesterday morning, they were still desperate to find out what happened to the pizza. Detectives say it's possible she went to a friend or acquaintance's place before she went home.

Chief Supt Jon Stratford, of Avon and Somerset Police, said: "There is obviously the possibility that she went somewhere else to eat that pizza. All we know is that we found her possessions inside the flat along with the receipt, but not the pizza. That indicates that she did get back on the Friday evening but obviously we are keeping an open mind."

He said they were continuing to trawl t h r o u g h C C T V footage between her l a s t c o n f i r m e d sighting on Friday December 17 up u n t i l s h e w a s reported missing by her boyfriend Greg at around midnight last Sunday.

Greg - who works for the same company as Joanna - returned home to Bristol at 8pm on Sunday after spending a weekend with his family in Sheffield.

Although police seized his laptop and mobile phone for examination, it is understood they do not believe him to be involved in her disappearance.