Cyanide Murder Mystery

It's a murder mystery involving husband and wife, both esteemed specialists at the University of Pittsburgh Medical Center. After Dr. Autumn Klein suddenly died by cyanide poisoning in April, police have targeted a suspect, her husband.

Robert Ferrante remains behind bars this morning awaiting his trial. Prosecutors accuse the 64-year-old medical researcher and professor of poisoning his 41-year-old wife, CNN's Chris Cuomo reports. [Watch above video]

After a 3 month investigation following her heath, authorities charged her husband with criminal homicide. He pleaded not guilty at his arraignment this week.

The police search warrants say Ferrante allegedly prepared five grams of creatine for his wife to take in the morning and evening, by mixing it into a sugary drink or putting it on her toast.

One possible motive is that police allege in the affidavit that Ferrante thought his wife might be having an affair.

Ferrante's defense lawyer, Bill Difenderfer, spoke to Cuomo about his client and the case.

"I can tell you, my client is adamant he had nothing to do with the cause of her death. At this point, we're not even prepared to concede that she passed away from cyanide," he says. Watch: