Page "Roz Forrester" Paragraph 2

She and Chris were investigating a murder case in Undercity in the year 2975 when they encountered the Seventh Doctor and Benny.

It was revealed that Roz had killed her former Adjudicator partner, Fenn Martle, when she discovered he had been taking bribes.

Her memory of this event had been manipulated by Tobias Vaughn, so that she believed Martle had been killed by an alien.

This led to her having strong xenophobic feelings, which the Doctor managed to temper but not completely remove.