Gary McKinnon's ten-year battle against extradition is over after Home Secretary Theresa May confirmed that he would not be placed in the hands of US authorities.
His mother, Janis Sharp, thanked Home Secretary Theresa May for blocking her son's extradition, saying: "Thank you Theresa May from the bottom of my heart - I always knew you had the strength and courage to do the right thing."
In a statement to the House of Commons, Mrs May said the "seriously ill" computer hacker would not be extradited as he was a suicide risk.
"The decision to extradite would be incompatible with Mr McKinnon's human rights," she said.
"As the house would expect I have very carefully considered the representations made on Mr McKinnon's behalf," she told MPs.
McKinnon was accused by US prosecutors of "the biggest military computer hack of all time", but he claims he was simply looking for evidence of UFOs.
Mrs May said the sole issue she was considering was whether "extradition to the United States would breach his human rights".
There was no doubt McKinnon is "seriously ill" and the extradition warrant against him should be withdrawn, she said.
It is now for the director of public prosecutions Keir Starmer QC to decide whether he should face trial in the UK, Mrs May added.
A so-called forum bar will also be introduced to extradition proceedings to enable a UK court to decide whether a person should stand trial in the UK or abroad, Mrs May added.
It will be specifically designed to ensure it does not fall foul of "delays and satellite litigation", Mrs May told MPs.
Home Office medical evidence showed McKinnon was very likely to try to kill himself if extradited to the US, where he faced up to 60 years in prison if convicted.
The US stance also appeared to soften this summer, with government adviser John Arquilla saying they should be recruiting elite computer hackers to launch cyber-attacks against terrorists instead of prosecuting them.
Both Prime Minister David Cameron, who has held talks on the case with President Barack Obama, and his deputy Nick Clegg have previously publicly condemned plans to send McKinnon to the US.
McKinnon's mother Janis Sharp said yesterday: "People like this would not use Gary's case as a key part of an election campaign and then leave him for two-and-a-half years and then throw him to the wolves.
"It would seriously damage their reputations in terms of honesty and integrity."
McKinnon, from Wood Green, north London, was arrested in 2002, and then again in 2005, before an order for his extradition was made in July 2006 under the 2003 Extradition Act.
That triggered three successive applications for judicial review and questions about the fairness of the UK-US extradition treaty, which critics claim is one-sided.