Follow KDKA-TV: Facebook | Twitter

PITTSBURGH (AP) — The Pennsylvania Supreme Court has declined to hear the appeal of a former University of Pittsburgh medical researcher convicted in what prosecutors say was the cyanide poisoning death of his wife.

READ MORE: City Of Pittsburgh Closing Rialto Street So Crews Can Repair Steps

Sixty-nine-year-old Robert Ferrante was convicted of murder and was sentenced to life without parole in the April 2013 death of 41-year-old Dr. Autumn Klein.

(Photo Credit: KDKA)

Allegheny County prosecutors say he put cyanide in her energy drink, which text messages show he urged her to drink to enhance her fertility.

READ MORE: State Police Arrest 20-Year-Old Wanted For Arson, Domestic Assault

An appeals court rejected defense arguments that cited a successful transplant of Klein’s liver as evidence that cyanide couldn’t have killed her.

(Photo Credit: KDKA)

Defense attorney Chris Eyster told the Tribune-Review on Wednesday he will seek further review of the conviction. He says they’re confident they’re “going to get this reversed.”

MORE NEWS: Carnegie Mellon University Reminding Students They Must Be Vaccinated For Upcoming Semester

(© Copyright 2018 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)