The Headhunter

The Headhunter was a bounty hunter encountered by the Eighth Doctor and Lucie Miller on numerous occasions. (BFA: Blood of the Daleks)

Biography
The Headhunter was contracted to kill Lucie Miller and was given time travel technology in order to track the Doctor's TARDIS. (BFA: Human Resources)

The Headhunter finally sacrificed her life to save the universe from the Eight Legs. (BFA: Worldwide Web)