Her departure comes after she accused Ryan Thomas of "assaulting" her while they were play fighting, and later demanding that he be removed from the house.
In a statement, Channel 5 said: "Roxanne has made a decision to leave the BB House. The remaining housemates have been informed", a Celebrity Big Brother spokesperson said, adding there would be no further comment.
The allegations have sparked over 11,000 Ofcom complaints and thousands taking to Twitter to claim Pallett invented the allegation in an attempt to get Thomas evicted - who is now the bookies favourite to win the series.
The incident allegedly took place in the kitchen of the Big Brother house. "And we weren't play-fighting, there was no banter; it wasn't a joke".
He said: "I want you to know from the bottom of my heart I was showing my affection".
Lucy wrote to her 1.57million Twitter followers: "I don't think she is mentally fit to be in the house".
US Senator John McCain is dead
The 81-year-old McCain went on to die hours later, surrounded by family at his Arizona home after a battle with brain cancer. Instead, Trump issued a brief statement on Twitter Saturday night, that did not mention any of McCain's accomplishments.
"Maybe it came across the wrong way".
He said: "I trust Roxy and trust what she was saying".
Speaking in 2016 after she left the house early in the wake of David Bowie's death, Angie said: "You don't get paid your full fee, there's like a clause, you get a per day rate".
Tearing up, Roxanne said: 'I'm not questioning your integrity.
"I'm in shock, I went from upset to angry".
As well as her acting career, Pallett also co-hosts the Breakfast Show on York-based radio station Minster FM.
She said: "Ouch that hurt, I was going to wash your clothes but I might shrink them now".
The next episode of Celebrity Big Brother will air on Virgin Media Two / Channel at 10pm on Saturday 1 September.