Shed innocent blood very much - Like the deities he worshipped, he was fierce and cruel; an unprincipled, merciless tyrant: he slew innocent people and God's prophets.
Compare Jeremiah 2:30; Hebrews 11:37; Isaiah 57:1-4. According to tradition, Isaiah was among the first to perish. More than a century afterward, the final judgment upon Jerusalem was felt to be in an special way the punishment of Manasseh‘s bloody persecution of God‘s people (marginal reference).