The victim was followed from Whitehawk Way, Brighton, to her home.
A 46-year-old man has been released without charge after being arrested on suspicion of robbing a 75-year-old woman.
The man went to Brighton police station at 6.30pm on December 31 after hearing about the investigation into the robbery in Whitehawk Way, Brighton, on December 17.
A police spokesman said he was arrested on suspicion of robbery and questioned but released without charge.
Police continue to investigate the crime, in which the great-grandmother was robbed of a £200 pension.
Anyone with information about the robbery, which took place from 10am to 10.30am on Wednesday December 17, should email 101@sussex.pnn.police.uk, quoting serial 1485 of December 17, call 101 or call Crimestoppers on 0800 555 111.
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