because he has other thing to do Well all doctors have to leave or 'regenirate' plus he has to do some other stuff like be on another show. bye!! @ franboink
unfortunatly yes but he is doing a few more specials
David Tennant will be leaving because he wants someone else to have a go at being the Doctor, And as some people know Matt Smith will be the doctor in 2010 after several specials. But David Tennant will be remembered forever as the BEST DOCTOR!!!
He has done 4 Christmas specials and one Easter special, with three more in 2009.
Planet of the Dead The Waters of Mars The End of Time (part one and two)
David Tennant is The 10th Doctor in Doctor Who.
No, he is the tenth doctor in the series of doctor who.
David Tennant played the Doctor from 2005 to 2010.
David Tennant is famous for acting in Doctor Who
David Tennant stopped being the doctor new years day 2010. (I'm guessing you mean when the 10th doctor regenerated) He announced that he was leaving Doctor Who about a year before that though. I cried because I loved him as the Doctor so much! :-(
The final Doctor Who specials featuring David Tennant as the Doctor aired in December 2009 and January 2010
matt smith
Yes!