CONCORD, N.H. (AP) — Lawyers representing New Hampshire's only death row inmate are appealing two robbery convictions.

WMUR-TV reports attorneys for Michael Addison argued Wednesday judicial bias influenced the convictions. Addison was sentenced to death for the 2006 killing of Manchester police officer Michael Briggs and later convicted of two armed robberies.

According to officials, Judge Robert Lynn declined Judge Kathleen McGuire's initial request to oversee Addison's case because cases are assigned randomly. Officials say McGuire was ultimately assigned to the trial because other judges were unavailable.

Defense attorney Edward Sackman says the information about McGuire volunteering for the case is new evidence. Sackman claims it could've altered the trial.

Prosecutors deny claims McGuire was biased and maintain the judge was fair.

Addison's federal appeal is on hold pending the robbery appeals.

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Information from: WMUR-TV, http://wmur.com