BELLEFONTE -- The disappearance of former Centre County District Attorney Ray Gricar will be featured on Dateline NBC.

Crews finished interviewing in the region Monday for the segment scheduled to air at 8 p.m. Saturday, Dateline NBC reporter Sara James said after taping an interview with District Attorney Michael Madeira.

Gricar has not been seen or heard from since April 15, 2005, when he said he was taking a drive on state Route 192 toward Lewisburg. His car was found a day later in a parking lot in Lewisburg.

Police have worked on three theories: murder, suicide or intentional disappearance. After interviews with Madeira, lead investigator Darrel Zaccagni of the Bellefonte Police, and Gricar's girlfriend and housemate, Patty Fornicola, James said, "All of the possibilities seem equally possible and equally plausible."

She and the investigators said they hoped a national airing of the case would generate new leads. "We're at a dead end," Madiera said. "So we'll take any leads we can get."