DURHAM, N.C. (AP) — Lawyers for a man who has spent 21 years in prison for a double murder are trying to show a judge that he didn’t commit the crimes.

Attorneys for Darryl Howard say he was wrongly convicted by insufficient DNA evidence and misconduct by police and prosecutors, including ex-district attorney Mike Nifong, who was disbarred for his handling of the Duke University lacrosse case.

A judge is hearing three days of arguments beginning Monday and will decide if Howard deserves a new trial. Howard was sentenced to 80 years in prison in 1995 after being convicted in the strangling of a North Carolina woman and her 13-year-old daughter.

Prosecutors argued the DNA evidence is irrelevant and jurors at Howard’s trial heard witnesses testify they saw him at the scene.