Updated

A convicted murderer sentenced to more than a half-century behind bars is suing the state of Connecticut, saying its ban on pornography in prison violates his constitutional rights.

Dwight Pink Jr. says in the lawsuit filed in U.S. District Court in July that guards have used the policy to deny him an art book that depicts how to draw the human form.

Pink says the ban is a violation of his free speech rights and serves no meaningful objective in prison.

The state filed its response Monday and says Pink has not been harmed by the ban and none of his rights were violated.

Pink is serving a 56-year sentence for his part in the 1998 slaying of a father of two in Old Saybrook.