Apostacy in Islam - the Bad, the Ugly, and Gruesome Death

I have heard often by liberal / moderate Muslims and liberal Islamic apologists non-Muslims that the punishment for apostacy is not in the Quran. So, this is just a mere interpretation of some extremists.

Tell that to every person who leaves Islam that is attacked or killed. "Oh no, but your murder is not in Quran. So I guess, it didn't happen". If you …