Here is a BBC report:
Taseer - who had a record of protecting minority communities in Pakistan - was campaigning on a blasphemy case, that of a Christian woman called Asia Bibi.Here is the Wikipedia page on the relevant issue. Now decide whether BBC has covered the whole news or not.
Some Muslim women in her Punjab village accused her of defiling their well by drinking out of it and they demanded that she convert.
She refused and they accused her of blasphemy.