Emmanuel-Thomas, who also played for Aberdeen, QPR and MK Dons, has been jailed for four years this week.
"It is through your own actions you will no longer be known as a professional footballer; you will be known as a criminal," Judge Alexander Mills told him at Chelmsford Crown Court.
"A professional footballer who threw it all away."
The court was read a handwritten letter penned by 34 year-old Emmanuel-Thomas to Judge Mills.
He wrote: "This past year has been the most harmful and eye-opening of my life.
"At times it has been unbearable."
Of his daughter visiting him in prison, he also said: "Watching her walk into the space broke me. I never wanted her to see me in that light."
