I've just retrieved last week's Radio Times from the bin. It shows that the episode broadcast at 9pm last Saturday was the final programme of the first 13 episode series made for Swedish television. (It also mentions that the actress who played Linda, Johanna Sallstrom, committed suicide three months after the first showing of the programme).
'Wallander' was later remade in an English version, with Kenneth Brannagh taking the title role. The first episode of the first series was transmitted in the 9pm slot tonight.
Wikipedia expands upon my post:
http://en.wikipedia.org/wiki/Kurt_Wallander
Chris