Steven Avery writes letter from prison claiming his innocence
MANITOWOC, Wis. (CBS 58) -- Steven Avery has a message for his supporters.
Avery's Attorney Kathleen Zellner tweeted out a handwritten statement from prison.
Avery claims he was framed for murder and is seeking an appeal.
Avery is the subject of a popular Netflix documentary 'Making a Murderer.'
He was convicted of killing Teresa Halbach in 2005.