Labour's shadow housing minister Melanie Onn has quit the Labour frontbench after being whipped to vote for a second referendum.
The Great Grimsby MP had already said she could resign if she was forced to vote for another vote.
Ms Onn, who represents a leave-voting seat, received death threats after she came out against a second referendum.
She said at the time: "“It wouldn’t at all surprise me, if there was a second referendum, that the vote – while it might be marginally lower than it was [in 2016] – would not be a significant shift. I still think Grimsby would vote to leave.”
But her stance was met with abuse.
She shared a message she received from a member of the public, calling herself Helen.
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It read: “’You are a f****** traitor you silly f****** bitch.
“We will remember your actions you spineless s***. Watch your back or you will not be forgiven. TRAITOR.”’
The MP said the same person sent a follow-up email including the message: “The likes of you should be f****** gunned down.”
She is one of a number on the shadow front bench who represent a leave constituency.
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But the Mirror understands a number of Ms Onn's colleagues have decided to abstain on plans for a second referendum in the hope that they will be allowed to keep their jobs.
Labour MPs were told to back a motion tonight calling for a second referendum on leaving the European Union as part of the "indicative votes" on the Brexit options taking place tonight.
The plan, by MPs including Dame Margaret Beckett and Peter Kyle, would require a public vote to confirm any Brexit deal that is passed by Parliament.
Some suggest that could be set up as a full-blown referendum between Remain and the Brexit deal.
It follows a furious and very public row which saw senior figures publicly disagree over whether the party would back the call in tonight's Brexit votes.
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