The sister of one of the soldiers murdered by the Real IRA at Massereene Army Barracks says those who supported the free Marian Price campaign should "hang their heads in shame".
Jaime Quinsey, sister of Sapper Mark Quinsey (23), has emigrated to New York to escape her painful memories.
Last week, Price (59), was found guilty of supplying a mobile phone to the Massereene killers, which they used to claim the atrocity.
Sappers Quinsey and Patrick Azimkar (21), died in the March 2009 shooting while a pizza delivery worker was injured.
The Old Bailey bomber had protested her innocence since her early release license was revoked by then Secretary of State Owen Paterson in May 2011 shortly after she was pictured holding a speech for a masked terrorist to read during a dissident republican rally in Londonderry.
Sinn Fein and SDLP politicians campaigned for her release.
However, at the last minute, Price changed her plea to guilty to providing property to aid terrorism at Belfast Crown Court on Thursday as well as the charge of aiding and abetting the addressing of a meeting to encourage support for terrorism.
She had been caught on CCTV buying the mobile phone from a Tesco store in Newtownabbey just hours before it was used by the terrorists.
Jaime Quinsey told the Belfast Telegraph that those who campaigned for her release should "hang their heads in shame", and also demanded an apology from them.
She is the last direct relative of Sapper Quinsey after their mother Pamela Brankin (51), died earlier this year at her home in Birmingham.
Ms Quinsey said that her mother died of a broken heart after the murder of her son.
She has now moved from Birmingham to New York in an attempt to escape the painful memories.
She said all of her family are now dead because of the Massereene murders and criticised Price's last minute guilty plea as an attempt to get a shorter sentence.
"She will get a reduced sentence and not suffer," she said, adding that everyone who was involved in trying to help her and secure her release should "hold their heads in shame".
"They owe big apologies and it proves the system over there is completely wrong."
Last week, DUP South Antrim MP Willie McCrea called for the SDLP to apologise over its backing of Price.
SDLP MLA Alban Maginness insisted his party position was "right at the time", adding it would repeat it in similar circumstances.
Yesterday, Mr Maginness stuck by his stance despite the plea from Ms Quinsey.
"Everyone has a right to due process and equal treatment before the law regardless of the crime," he said.
"In the circumstances of her licence being revoked, Ms Price was denied due process and equality before the law.
"The SDLP was right at the time to protest about her continued imprisonment and would do so again in similar circumstances.
"The SDLP does not support imprisoning people because of intelligence or a political viewpoint. That is and will remain our position.
"Justice must be done and be seen to be done and we are satisfied that proper legal processes are now being followed," he said.