Parvin, 73, of Aberdeen is serving a life sentence at a Meridian prison facility.
His 2011 conviction and sentence were “fatally infected by ineffective assistance of counsel,” who is accused of failure to call any expert witnesses or Parvin to refute the state’s case against him.
The Mississippi Supreme Court will hear oral arguments on the appeal Nov 19.
Timothy Ervin of Aberdeen, Parvin’s trial attorney, declined to comment on the case.
Parvin’s new attorneys are Tucker Carrington with the Mississippi Innocence Project, former Supreme Court Justice James L. Robertson and Jim Waide of Tupelo.
They also take aim at controversial pathologist Dr. Steven Hayne, whom they say was not qualified to testify about the distance between the woman’s fatal wound and the shotgun.
The defendant, a former Mississippi State University professor who earned a Ph.D in economics, insists he shot his wife by accident and that he should have been allowed to offer his own opinions about the evidence used by state expert witnesses.
His case was tried in Monroe County circuit court.
In their motion to the Mississippi Supreme Court, the appeals attorneys include copies of canceled checks by Parvin to retain Ervin and to hire defense experts.
The motion also claims Hayne’s credibility is a key issue after his alleged false claims about his professional qualifications and educational achievements.
Hayne was a crucial state witness against Tyler Edmonds in the 2004 Oktibbeha County capital murder case in which teenager Edmonds was convicted and sentenced to life in prison.
His conviction was overturned four years later, especially because of Hayne’s lack of qualifications to testify about how Edmonds’ brother-in-law was shot. A new jury found him not guilty.