The broadcasting veteran says producers are currently on the lookout for a presenter to step into her shoes in the New Year.
Carlow native Kathryn had hinted that she might be stepping down from the top game show after she landed the highly sought-after role as host of RTE's new talent show The Voice.
With the new series of Operation Transformation and the talent show taking place at the same time, Kathryn admitted that a shifting of schedules was imminent.
Speaking to the Herald, Marty (55) said he was sad to see Kathryn go, but insisted the new presenter had yet to be chosen.
“Of course I am sad about her leaving, change is always difficult. But the show is huge and now we have to see who the next person in line is. I couldn't possibly say who it is yet. I am part of the conversation at the moment, but I don't know just yet. I can tell you now that there has been no decision made.”
Kathryn (32) joined the game show in 2008, following in the footsteps of Laura Wood, Aidan Power, Derek Mooney and Mike Murphy.
Although Marty remained tight-lipped on the details of Kathryn's replacement, the top presenter was happy to talk about Jedward's decision to re-enter Eurovision next year. Marty, who commentates for RTE on the annual song contest, said he truly believed the Lucan twins could win it this time around.
“They have been so incredible for us this year, it's the best we have done at the Eurovision for years. Brian Kennedy was the last person to do so well. The guys are great and they just have something. They have been touring around Europe and that's opening lots of doors for them as well,” he said.
“The thing is, because we are a tiny island, we never know what is going to happen. We have to depend on everyone else to help us out but, fingers crossed, it will work out this year. I would love them to win.”