Wallasey MP Angela Eagle has resigned as shadow business secretary and shadow first secretary of state.
In her letter of resignation she tells Jeremy Corbyn: "It is with the greatest of sadness that, after nine months of trying to make your leadership work and despite your considerable personal qualities.
"We need a leader who can heal the deep divisions in our country, stand up for our communities, and ultimately to keep our United Kingdom.
"I have come to the conclusion you are not the right person to lead the party we both love."
Twenty-seven of Mr Corbyn's team have now resigned over Brexit.
Here is Ms Eagle's letter.
Eight members of the shadow cabinet quit on Monday, with Ms Eagle, who as shadow first secretary of state deputised for Mr Corbyn at Prime Minister's Questions, the most senior.
She said Mr Corbyn needed to think about whether he should stay as Labour leader.
Looking downcast, Ms Eagle told reporters outside Parliament: "I've made it clear that I don't think it's working, and Jeremy needs to think about his position."
Her twin sister Maria also resigned as shadow culture secretary, while John Healey, Lisa Nandy, Owen Smith, Nia Griffith, Kate Green and Luciana Berger also quit - adding to the 12 shadow cabinet members Mr Corbyn lost on Sunday.
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