Whenever the viewing figures drop too low and it's no longer popular.
2013
That was called the Song of Freedom. It is available on the Doctor Who - Series Four CD - out now.
The 13th episode in the 4th series of Doctor Who is called 'Journey's End'.
The Doctor is never in Torchwood, but at the end of 'End of Days' you can hear the TARDIS and then Jack is in 'Utopia' which is the eleventh episode of series three of Doctor Who
Series 4, episode 13: Journey's End.
Journey's End (series 4 episode 13). - Edit: Episode 14 is Journey's end.
The 9th Doctor was Christopher Eccleston and the 10th Doctor is David Tennent, but the current Doctor is Matt Smith who is leaving the series at the end of 2013.
The television series "Doctor Finlay" ended in 1996 after three seasons.
It started in April, and then the series slits in two; the first part of the series is finishing at the end of may, and the second part of the series starts in autumn
If you're talking about the end of series 6, no. It was a Teselecta in his place.
The Tenth Doctor (a.k.a David Tennant) did not die. In fact, he regenerated into the Eleventh Doctor (a.k.a Matt Smith).
In the revived series (2005 to the current series), two companions have fallen in love with the Doctor. The first is Rose Tyler (she proclaims her love for him at the end of SE2EP13: Doomsday) and the second is Martha Jones.