"We will not tolerate prisoners using violence. A prisoner responsible for violent behaviour will be held to account for their actions.
"Prisoners who are assessed as being at risk of violence or intimidation from other prisoners may be placed on segregation, and managed separately from the general prison population."
High-profile Canterbury University criminologist Greg Newbold said the threat against Skeen should be taken seriously.
"It is pretty bloodcurdling and he will know about it, prison intelligence will tell him about the threat."