The two housemates playing for immunity and making killer nominations on Celebrity Big Brother have been revealed.
Sarah Harding and Sam Thompson have been voted for by the public to take part in the new twist, where they stand to gain immunity but also risk eviction.
Earlier today, Big Brother gathered the group to begin a murder mystery task: "Housemates there has been a murder and the victim is none other than the infamously famous celebrity agent Stella Star.
"Shortly, Big Brother will call all suspects to the Diary Room individually. At least 2 of you will be told that you are the killers. Over the next 2 days, more of you will fall victim. Housemates, these cut-throat assassins are killer nominating.
Paul Danan and Brandi Glanville will have to uncover the killers and their success or not will determine the nominations.
"It is Detective Paul and Junior Officer Brandi's job to try and work out who these killers are," Big Brother revealed. "Tomorrow, Detective Paul and Junior Officer Brandi will decide which suspects they believe are the killers.
"If they guess incorrectly, then these undercover celebrities will have got away with murder and will be granted immunity from this week's eviction, whilst those that they have killed will face the public vote. If however they are caught red handed, the killers themselves will face eviction."
In the Diary Room, Sarah and Sam were told they were the killers by Big Brother: "Sarah the public have voted and they have chosen you as a killer. Your fellow killer is Sam. Tomorrow the Criminal Case team will be given the opportunity to guess which housemates are the killers.
"If Detective Paul and Junior Officer Brandi work out that you and Sam are the killers then you will both immediately face eviction this week. If however you manage to pull off the perfect crime then you will be immune from Friday's eviction."
Between now and then, Sarah and Sam have to make a number of big decisions: "You are gong to killer nominate a number of housemates You are permitted to pick from any of your fellow housemates including the detectives. You are not permitted to killer nominate yourself or each other.
"Nobody knows how many killers there are, so you should bear this in mind. The detectives will not be told there are two murders until they have to choose their killers tomorrow. They must get both killers right.
"The way you killer nominate will change each time and Big Brother will let you know what your secret mission is beforehand. Yo should think carefully about clever ways of completing these missions together so that you go completely unnoticed."
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Celebrity Big Brother 2017 continues nightly on Channel 5.