He's the third blogger to be murdered there this year (so far).
And lest you think he did something really "blasphemous," like, say, draw and/or "insult" Islam's founder, the subject matter of his blog--"materialism and rationalism"--sounds about as un-incendiary as it gets.
But then, you never know exactly what's going to incite the fanatical. What you can be sure of is that, for those who don't believe in free speech and who are convinced it's antithetical to the teachings of their religion, what you say doesn't matter as much as the fact that you feel free to say it. It is an individual's perception of freedom which they see as the biggest threat to their world order, and which therefore much be snuffed out--typically, in the most violent possible manner--to send a message to others with a similar "misperception."