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Igoe is currently serving a minimum 20-year jail term for gunning down boyfriend Martyn Barclay with a handgun in an Edinburgh street in 2009.
The 43-year-old former glamour model was caged for the shooting following a trial at the High Court in Edinburgh.
She is currently serving her sentence at HMP Grampian and was brought to Edinburgh Sheriff Court on Tuesday to answer allegations of possessing the SIM card and drug offences.
The mum-of-four was alleged to have been caught with quantities of the strong pain killers Etizolam and Buprenorphine within a cell at HMP Edinburgh on March 10 last year.
But the murderer’s pleas of not guilty to both drug charges were accepted by prosecutors during Tuesday’s court hearing.
Igoe admitted possessing the mobile phone SIM card at the capital prison on the same date.
Sheriff Peter McCormack warned Igoe of her future conduct and decided to hand out an admonishment on the charge.
Igoe pleaded guilty to possessing a mobile phone SIM card at HMP Edinburgh on March 10 last year.
She had not guilty pleas accepted by the Crown to possessing a quantity of Etizolam and a quantity of Buprenorphine at HMP Edinburgh on March 10 last year.
Igoe is currently attempting to clear her name after making a bid to be freed halfway through her sentence earlier this year.
An online petition was launched in December 2019 and its aims are to have her case reviewed so she can “walk free” from her current prison sentence.
The Free Caroline Igoe petition at Change.org states: “Caroline has maintained her innocence for a decade now and will continue to fight to clear her name and get the freedom she deserves.
“She does not just want her freedom and to just walk free and away from this she wants her case looked into properly so she can clear her name as a ‘murderer’, which she is not.
“She has spent a decade away from them [her children] now for a crime she did not commit, and she needs to be out making this up to them, building a future and making new memories.”
Igoe was convicted of shooting boyfriend Martyn, 26, in the head with his own handgun in the Inch area of Edinburgh in January 2009.
Martyn, who had worked as a labourer, was discovered dying in the street outside the home he shared with Igoe and her family in Hazelwood Grove by a man on his way to work.
He was taken to Edinburgh Royal Infirmary, where he died later.
Prosecutor Alex Prentice QC said Martyn’s death was an “act of cold-blooded murder executed with a chilling military precision”.
Her brother Paul Igoe, 37, was jailed for six years for attempting to cover up the crime. He was cleared of murder.
Lord Bracadale told him that he had hampered the police murder inquiry by taking away and disposing of the gun.