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. 


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