BANGOR — A 25-year-old South Dakota man has pleaded not guilty to killing a homeless man in Bangor by setting him on fire.

Kenneth John Bruning is charged with murder in the death of 34-year-old Trevor Sprague, of Lubec. Sprague’s body was found engulfed in flames under a downtown Bangor bridge on March 7, 2006.

Bruning entered his plea today in Penobscot County Superior Court, but he waived a bail hearing.

Bruning this month was brought to Maine from Rapid City, S.D., where he was in jail on unrelated charges.

His attorney, Jeffrey Silverstein, told reporters it’s possible Bruning may change his plea to not criminally responsible by reason of insanity. A trial date has not been set.