Advice requested on inmate friend

Allow me to clarify, a friend of mine that was like an older brother to me (for years) was arrested and has been in holding since the pandemic started. After all that time, secrets of his past were found out and it left me uncomfortable and heartbroken. I recently wrote an email stating it will be the last and wished him luck. He tried to call me but I didn't answer and he is still arrested in holding where he's awaiting sentencing.

Did I do the right thing by cutting that person off or should I continue to correspond to him until his sentencing?