Far right fanatic Thomas Mair has been handed a whole life term for murdering the Labour MP in what prosecutors called an "act of terrorism".
Mrs Cox was stabbed 15 times and shot outside her constituency office in Birstall, West Yorkshire.
The husband of Jo Cox MP said that her killer has committed an act of "terrorism" which had backfired to unite the country in grief.
Brendan Cox said he had seen Britain at its "compassionate, courageous and kind" best in response to the killing carried out by Thomas Mair.
She may have only served her constituents for little more than a year, but those whose lives Jo Cox touched won't forget her lasting legacy.
Thomas Mair is being described as an extremist, a fanatic, an assassin – even ‘a constituent’. But make no mistake – he is a terrorist.
Thomas Mair "betrayed the quintessence of our country" in the senseless killing of MP Jo Cox, the judge said.