This is Steven Avery, a 53-year-old American, who is currently serving a life sentence for murder.

He's always denied killing 25-year-old Teresa Halbach, whose remains were found close to Avery's home in 2005.

Now his new lawyer claims he has an "airtight alibi" proving once and for all that it wasn't him.

This is potentially huge news for the Avery family and anyone who has binge-watched the 10-part Netflix documentary, Making a Murderer.

Kathleen Zellner has reportedly filed an appeal for her client, which is due to be heard in court.

And she's been tweeting about what she might argue.

The lawyer claims only details of the incoming and outgoing phone calls were heard during Avery's original trial and that there is now more detailed information available.

Prosecutors claim Teresa Halbach was last seen at Avery's salvage yard when she disappeared.

The (epic) backstory

Avery was wrongfully imprisoned for 18 years for sexual assault.

In 1985 he was charged and convicted for sexual assault, false imprisonment and attempted murder.

But in 2003 he was released when advances in DNA technology proved it was another man.

After being set free and living a normal life for a short while, he was then accused and found guilty of the Halbach murder.

Many think he was set up by law officials in Manitowoc County, Wisconsin, who feared they faced a huge financial penalty over the first case.

But those officials have always dismissed the claims as conspiracy theory.

Find us on Instagram at BBCNewsbeat and follow us on Snapchat, search for bbc_newsbeat