(CNN) Brendan Dassey, the man whose murder conviction is at the center of Netflix's "Making a Murderer," is petitioning for clemency after spending more than a decade in prison.

Dassey's attorney Laura Nirider announced Wednesday his defense had filed a petition for clemency with Wisconsin Gov. Tony Evers.

In 2005, when he was 16, Dassey confessed to authorities he'd helped his uncle rape and murder photographer Teresa Halbach. He was convicted of her murder in 2007 and has been serving a life sentence in a Wisconsin prison ever since.

Brendan Dassey is seen here in footage from "Making a Murderer." He's petitioning the Wisconsin governor for clemency.

In the petition, shared on the website for the "Wrongful Conviction" podcast , the attorneys argue that Dassey, now 29, should be freed on grounds that his confession was disproved by physical evidence at the scene and his inability to accurately describe the method in which Halbach was killed.

The petition said that "extreme attorney misconduct" marred his conviction. She said Dassey's attorney, Len Kachinsky, pressured his client into pleading guilty after Dassey was coerced into making a false statement.