Nicholas Briggs (in-universe)

A man with a beard who voiced Daleks worked in the Dalek Dome. (COMIC: )

Biography
After trying to help a little girl who was lost find her way again, he was killed by Georgy Gold when she was hypnotised by the Dalek simulacra. (COMIC: )

Legacy
In the 2020s, a father helped his son place a star with Briggs's face on it atop a Christmas tree. (WC: )

Behind the scenes
Though not stated to be such, the man is clearly Nicholas Briggs, a prolific real-world voice actor who has portrayed the voice of the Daleks for both Big Finish Productions and the revival series of Doctor Who.