Chenna

Chenna was a member of the Walker Expedition to Krop Tor. She found the possessed Curt in the control room of Sanctuary Base 6 after she smelled burning. (WC: Tardisode 9)

Behind the scenes
According to the reference book The Time Traveller's Almanac, a non-narrative source, after Chenna found Curt, he wiped her memories, killing her.