Jeremy Corbyn's newly appointed shadow education minister will quit at the next election after a "divisive" referendum which saw her receive death threats.
North West Durham MP Pat Glass did not attend the referendum count after police received four threats about her.
Mrs Glass, who was promoted on Monday from shadow Europe minister to shadow education minister, did not see the threats but they were taken seriously enough by the police for her to be warned.
She said: "Police advice was that it was best to avoid being in places I was expected to be and I decided not to attend the count."
A malicious email was also sent to a member of her family, the pro-Remain politician said.
She went on: "To some extent people like me put ourselves out there but stuff directed at our families is beyond the pale."
And in a letter to her constituency party chairman today, she announced that she would not contest the next General Election.
She wrote: "Whilst I had always intended to do no more than two terms in Parliament I have found the last six months very, very difficult.
"The referendum has been incredibly divisive, it divided families and communities and I have found it bruising in many respects.
"It has had an impact on both me and my family as I am sure it has had on many others."
The MP suffered a furious backlash during the campaign after describing a voter as a "horrible racist" on radio.
She later apologised and admitted her comments were "inappropriate".
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