he was convicted of making i think threats to people and even though he was locked up threatning letters were still sent out to people so he was put in solitary confinement where he couldnt write at all but threatning letters were still sent out and he was asked before he got sent to prison to write a letter and he asked an officer who told him to copy the words if he could see the letter himself.but the alleged person who wasnot the guy in prison was seen on a side road he was chubby and white by a eyewitness who i think was riding a bus i think this crime took place in ohio ad ithink the person who got locked up killed his sister in law.

From wiki:

The Circleville Writer - an unidentified letter writer that terrorized the town of Circleville in 1977 with letters threatening people's lives and making fake allegations. He/she is wanted for attempted murder and a person named Paul Freshour was arrested and convicted of the crimes. However, he was eventually released, but the identity of the writer is still unknown. The story was shown on Unsolved Mysteries.

From wiki:

The Circleville Writer - an unidentified letter writer that terrorized the town of Circleville in 1977 with letters threatening people's lives and making fake allegations. He/she is wanted for attempted murder and a person named Paul Freshour was arrested and convicted of the crimes. However, he was eventually released, but the identity of the writer is still unknown. The story was shown on Unsolved Mysteries.

yes thanks thats the one maybe they can do some dna on the letters to find the person who worte it