We'll tell you coming up. First, the millionaire couple with ties to the governor of New Jersey, Chris Christie. Fire fighters rushed to the home to pull John and joist Sheridan from their home. Linzie Janis is on the story. Reporter: This morning, the mystery deepens over the death of John and Joyce Sheridan. A prominent New Jersey couple with powerful connections and close friends of governor Chris Christie. Command to division two. We found a second victim. We need a second recovery team. Reporter: They initially believed the September death was a murder-suicide. Finding the bodies of Joyce, a beloved retired school teacher, and her husband, John, CEO of a top New Jersey hospital and the a former state official. After responding to a suspicious fire at their home. I believe my neighbor's house may be on fire. Reporter: But a source close to the investigation says they were stabbed multiple times, at least three different weapons. Police have only retrieved two of those weapons. Now the state's attorney general's office launching a separate, parallel investigation. Amid concerns over the progress, local detectives have made. Officials telling ABC news the state investigators are providing additional manpower and expertise. A spokesperson for the Sheridan family exclusively telling ABC news, regardless of the reason, the couple's four sons appreciate the help. They sense and know and understand that there's a lot of frustration. And people feel we should just know. They understand this isn't for lack of trying on the part of law enforcement. Reporter: For "Good morning America," Linzie Janis, ABC news, New York. A real mystery there.