Cassandra Schofield

Cassie Scholefield was the mother of the Seventh Doctor's companion Hex. She met the Sixth Doctor on two occasions. (BFA: Project: Twilight, BFA: Project: Lazarus)

Her son, whom she referred to affectionately as "Little Tommy," was only six years old when she was killed by Nimrod in the Forge in 2004. (BFA: Project: Lazarus)