A man shouted "This is for Britain" as he killed Labour MP Jo Cox, the Old Bailey has heard.
She was stabbed 15 times and shot three times outside her constituency surgery in Birstall, near Leeds, on 16 June - a week before the EU referendum.
Jurors were told Thomas Mair, 53, killed the mother-of-two for "political and/or ideological reasons", and had researched "far right" material in the weeks beforehand.
Mr Mair, from Birstall, denies murder.
Mrs Cox, 41, had supported the Remain side during the EU campaign, and was due to hold a constituency surgery in a library after visiting a local school and care home when she was attacked.
'Cowardly'
Mr Mair told police officers "I am a political activist" after he was arrested less than a mile from the murder scene, the court heard.
Prosecutor Richard Whittam QC said: "Thomas Mair clearly held views that provided him with a motive - utterly misplaced of course.
"The prosecution suggests that motive was such that he killed her because she was an MP who did not share his views."
Mr Whittam continued: "As she arrived she was brutally murdered by one of her constituents, this defendant, Thomas Mair.
"It was a cowardly attack by a man armed with a firearm and a knife.
"Jo Cox was shot three times and suffered multiple stab wounds. During the course of the murder Thomas Mair was heard by a number of witnesses to say repeatedly 'Britain First'."
Jurors were told that 77-year-old Bernard Carter-Kenny was also injured as he tried to save Mrs Cox.
http://www.bbc.co.uk/news/uk-37978582
She was stabbed 15 times and shot three times outside her constituency surgery in Birstall, near Leeds, on 16 June - a week before the EU referendum.
Jurors were told Thomas Mair, 53, killed the mother-of-two for "political and/or ideological reasons", and had researched "far right" material in the weeks beforehand.
Mr Mair, from Birstall, denies murder.
Mrs Cox, 41, had supported the Remain side during the EU campaign, and was due to hold a constituency surgery in a library after visiting a local school and care home when she was attacked.
'Cowardly'
Mr Mair told police officers "I am a political activist" after he was arrested less than a mile from the murder scene, the court heard.
Prosecutor Richard Whittam QC said: "Thomas Mair clearly held views that provided him with a motive - utterly misplaced of course.
"The prosecution suggests that motive was such that he killed her because she was an MP who did not share his views."
Mr Whittam continued: "As she arrived she was brutally murdered by one of her constituents, this defendant, Thomas Mair.
"It was a cowardly attack by a man armed with a firearm and a knife.
"Jo Cox was shot three times and suffered multiple stab wounds. During the course of the murder Thomas Mair was heard by a number of witnesses to say repeatedly 'Britain First'."
Jurors were told that 77-year-old Bernard Carter-Kenny was also injured as he tried to save Mrs Cox.
http://www.bbc.co.uk/news/uk-37978582