Po

Po was a red Teletubby that was the nicest of the group, she died when the Voice Trumpets rised up too fast and bonked out Po’s head which caused her to be headless.

Here's some Trivia:

• Po is the only decapitated one of the group.
• Po is voiced by Pui Fan Lee who was actually the presenter of a Cbeebies show called "Show Me Show Me".
• Many people mistake Po for a male.