Death

Death was the cessation of life. The Ninth Doctor told Rose that "everything dies". (TV: The Parting of the Ways)

The Eternal, Death, was a personification of the concept. (PROSE: Timewyrm: Revelation)

In 2011, for several months following the Miracle Day, every human on Earth simply stopped dying. It was caused when the Three Families fed the immortal Jack Harkness' blood into the Blessing, which in turn relayed the template to everyone on the planet in seconds. (TV: The New World, The Blood Line)

Alternate timelines
In one alternate timeline, the Doctor died during the time war with the Enemy and his body was auctioned on 21st century Earth for its biodata. (PROSE: Alien Bodies)