PITTSBURGH — A new filing spells out reasons a former University of Pittsburgh medical researcher wants a new trial in the cyanide poisoning of his wife.

The Superior Court appeal was filed Wednesday on behalf of Robert Ferrante, 68, who was convicted of first-degree murder in November 2014 of the death of Dr. Autumn Klein.

Prosecutors say Ferrante killed his 41-year-old wife in 2013 by lacing her energy drink with cyanide.

Ferrante’s attorney contests the reliability of lab results.

The district attorney’s office says the claims “have no merit.”