MANITOWOC, Wis. (AP) -- A Manitowoc County man sentenced to life in prison for killing a young photographer in 2005 is seeking a new trial.

Steven Avery's attorneys filed court documents Monday contending he was denied a fair trial in 2007 because Judge Patrick Willis refused to allow evidence that several other people were possible suspects in Teresa Halbach's murder.

Avery's 30-page motion identifies other suspects and outlines possible motives for each.

Willis has not set a date for a hearing on the motion, the next step in appealing the convictions to the state Court of Appeals.

Avery and his nephew were convicted of killing the freelance photographer at the Avery family salvage yard. Halbach's remains were found in a fire pit near Avery's trailer home.

Avery had been granted several delays in filing the motion seeking a new trial.