Cotton also is facing a first-degree burglary charge, which prosecutors amended Wednesday to show Cotton intended to rape Martin when he entered her home through the garage while she was inside, court papers show.
Multiple witnesses told police they saw a black male exit Martin's car and enter her garage, and one witness observed a window screen on the ground and a storm window missing screws.
Cotton told police he was on the telephone the night Martin was killed when he heard sirens outside. He said when he walked outside he was pointed out to police and arrested.
Cotton denied ever setting foot in Martin's home, even though police arrested him after he crashed through her living room ceiling.