In Thursday's episode, Pallett, 35, was in tears as she told Big Brother about the alleged altercation and asked to sleep in a separate bedroom.
Big Brother said in a tweet this morning: "Roxanne has chose to leave the Big Brother house. The remaining housemates have been informed", a Celebrity Big Brother spokesperson said, adding there would be no further comment.
Lucy has responded to the news by posting the word "karma" on Instagram.
She said: "Ouch that hurt, I was going to wash your clothes but I might shrink them now".
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Ryan's brother Scott has also reacted, sharing a tweet from a fan calling Ryan "an absolute gent".
Later, Big Brother bosses called Thomas to the diary room where they pointed out that while "almost play fighting" he "punched Roxanne in the ribs".
"If that's the one thing she's got on me, well done".
"Please show the housemates the clip. I'm thinking, that's not right!" You can clearly see he's broken.
Roxanne has since released a statement saying she is now with her fiance and her family.
The official statement said: "Roxanne has chose to leave the BB House".
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"She has now been reunited with her fiance and family and thanks everyone for their support during her time in the show".
Roxanne and Ryan seemed to patch things up the day before she chose to leave.
And the pair were seen making up on Friday's show as Ryan said he did not intend to upset her.
He went on to say: "Just had a colleague who witnessed my encounter where I was falsely accused of violence, contact me and share the event".
'Let's just sort it out and make everyone else smile and move forward, ' Ryan replied.
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