Lynette White was stabbed over 50 times
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A 56-year-old woman arrested in connection with the original investigation into the murder of Cardiff prostitute Lynette White has been released on police bail.
Police revealed on Thursday that she had been arrested for offences relating to perjury and perverting the course of justice.
Detectives looking into the inquiry sent her a letter last week, asking her to attend Swansea Central Police Station, where she was questioned for several hours.
Police are now carrying out further inquiries.
Earlier this month, four people who were witnesses in the trial of three men wrongly convicted of murdering 20-year-old Ms White were questioned by police.
The four - Paul Atkins, Mark Grommek, Angela Psaila and Leanne Vilday - were arrested at Swansea Police Station on suspicion of perverting the course of justice and perjury.
They were later released on bail, pending further inquiries.
Yusef Abdullahi, Tony Paris and Steven Miller - who became known as the Cardiff Three - spent two years in jail for the murder of Lynette White in 1988 before their conviction was quashed by the Court of Appeal.
Earlier this year, security guard Jeffrey Gafoor was jailed for life after pleading guilty to her murder.
The inquiry was launched in July following the successful conviction of Gafoor.
Ms White was stabbed more than 50 times in a flat above a betting shop in Cardiff's docklands on St Valentine's Day 1988.
The discovery of her body prompted one of the biggest murder hunts ever mounted by a British police force.
The Cardiff Three were jailed for her murder in 1990 but released on appeal two years later.
It took 15 years to track down Ms White's real killer, but the breakthrough came following advances in DNA technology.