The news was confirmed by LBC Radio this morning, after a one-year long working relationship that began April 2016.
Controversial columnist Katie became the subject of a police review after the Manchester bombing on Monday.
Hopkins – who is also employed by Mail Online – was reported to the Metropolitan police for a tweet sent to her 736,000 followers in which she called for a “final solution”.
Former Celebrity Big Brother star Katie quickly deleted the tweet – which was directed at This Morning host Phillip Schofield – and instead posted an edited version after she was slammed for repeating the Nazi term for the Holocaust.
Katie’s original tweet read: “22 dead – number rising. Schofield. Don’t you even dare. Do not be part of the problem. We need a final solution. #Manchester.”
The 42-year-old then changed the latter part of her post, and changed it to read “we need a true solution. #ManchesterArena”.
“We need a final solution”
A fan replied to the former Apprentice star, asking: “How come you changed this from “final solution” to ‘true solution’? Come on, stand by those Nazi words, Nazi.”
Katie replied: “I stand by my tweet. I find the typo disrespectful to the survivors in Manchester.”
At the time, a spokesperson for the Met confirmed a complaint had been received, adding: “As is routine, the allegation will be reviewed and assessed by specialist officers.”
Katie’s shocking tweet came after the horrific terrorist attack at the Manchester Arena Ariana gig on Monday.
Greater Manchester Police confirmed that 22 people had died, and at least 59 were injured.
Salman Abedi called his mum to beg for forgiveness before he detonated the bomb which killed children, teenagers and their parents with a homemade explosive.
The 22-year-old jihadi walked into the foyer of the arena and detonated the device in a backpack.
His arrested brother Hashem – who is being held on suspicion of terrorist offences in Tripoli, Libya – claimed Salman wanted to “claim victory” for ISIS.