Professor Accused of Poisoning Wife with Cyanide

A University of Pittsburgh research professor faces an extradition hearing in West Virginia later today. Robert Ferrante is wanted on homicide charges in Pennsylvania for allegedly killing his wife with a lethal dose of cyanide back in April.

Ferrante is expected to waive extradition and be transported back to Pennsylvania. His arrest in West Virginia on Thursday ended a nation-wide manhunt. 

He is accused of poisoning his wife, Dr. Autumn Klein, chief of women's neurology at the University of Pittsburgh Medical Center. 

Police investigators scoured both the couple's home and at the university lab where Ferrante worked collecting evidence.

A 3-month investigation led to a criminal complaint against the 64-year-old Ferrante comprised of an alleged text conversation with his wife, urging her to go on a creatine regiment to help with fertility – the same substance investigators believe he laced with cyanide. The complaint also documents Ferrante placing an order for an "overnight delivery of cyanide" 2 days before his wife collapsed.

CNN legal analyst Paul Callan weighs in on the situation.

"There are no slam dunks in circumstantial evidence homicide cases," he says. "So I think he's going to put up 2 possible approaches here. One, he had a legitimate reason to have cyanide, he's a brilliant university researcher... the second issue that has been raised is suicide by her, but I'm telling you, that one's a rough one." Watch: