Don Airey, ex-Cozy Powell's Hammer, ex-Colosseum II, ex-Black Sabbath (he's all over Never Say Die), ex-Rainbow, ex-Ozzy Osbourne (the Mr Crowley intro is his composition, uncredited), ex-Gary Moore, ex-Whitesnake (he's all over 1987) ...
Since 2002!
Here's the handover, around 4:28,
Jon appeared at this final concert when Don Airey had already joined permanently (after standing in for Jon after the latter's knee surgery) and since then only appeared at two or three DP gigs on stage for the odd encore or such.
And, incidentally, Jon, a habitual latecomer during his life (but reliable in the long term) is now indeed late, Mark, and has been for three years! They just commemorated him in Leicester where he was born.
Now bow down, skirt up and be spanked, Mark!