The boyfriend of actor Morgan Freeman’s step-granddaughter has pleaded not guilty to second-degree murder over her stabbing death as newly-released documents showed he ranted about Christ and the devil to police officers after his arrest.

Morgan Freeman's step-granddaughter knew her boyfriend Lamar Davenport was "troubled" before he allegedly performed an "exorcism" on her.

The live-in boyfriend of actor Morgan Freeman’s granddaughter was charged with her murder yesterday, US police said.