 In the late 1980s, he cut a prison guard's throat and assaulted another, and was convicted for both and sentenced to two additional terms of nine years to life.He's been housed at Pelican Bay State Prison, California, since 1989, and was in indefinite solitary confinement in the Secure Housing Unit.The Secure Housing Unit, the highest-security unit at Pelican Bay, did not offer any art supplies, so Johnson created a paintbrush using hair, plastic wrap, and ballpoint pen refill, and created paint from M&M's candy coatings.