Hardin eventually adapted to prison life. While there, he read theological books, becoming the superintendent of the prison Sunday School, and studied law. He was plagued by recurring poor health, especially when the wound he had received from Sublett became re-infected in 1883, causing him to be bedridden for almost two years. In 1892, Hardin was described as tall and , with a fair complexion, hazel eyes, dark hair, and wound scars on his right knee, left thigh, right side, hip, elbow, shoulder, and back. On November 6, 1892, during Hardin's stay in prison, his first wife, Jane, died.