Kenneth Conley's lawyer entered the plea at a Wednesday arraignment. Dressed in orange jail clothing, Conley sat in a wheel chair with a leg he injured during his escape in a brace.
Prosecutors say he and Jose Banks scaled down nearly 20 stories using a makeshift rope on Dec. 18.
Banks was caught two days later. But Conley eluded capture until Jan. 4. Police stopped him outside a suburban apartment complex disguised as an old man and carrying a cane.
Before his escape, the 38-year-old former strip club worker already faced a maximum 20-year prison term for bank robbery. Escape carries a maximum 5-year sentence.