If you do a Google image search for "John Cannan", the first four hits all mention SJL in the caption, and she herself appears in the second row.
It was an extraordinary claim for the police to make when they can't even show JC had ever been to Fulham.
I really do think we need a change of the law in this area. It shouldn't be legal for the police, constructively or explicitly, to announce that someone has murdered someone, while presenting no evidence. In other cases, they've constructively done the same thing and demonstrable public harm arises. In the case of, say, Rachel Nickell, after the judge threw their disgraceful case against Colin Stagg out, the police huffily remarked that they weren't looking for anyone else. Nobody could take this as meaning anything other than that Stagg did it and the stupid judge had let him off.
Women who had small children and who followed the news might therefore have imagined that it was safe to be around Robert Napper, the actual killer for whom the police were not looking. Leaving aside the harm done to the hapless Stagg, saying someone who's innocent is a killer allows the real killer to carry on doing what he does.