Tim’s officially going back to nights — 6–10pm starting Tuesday, Feb. 17 — and we celebrate the return the right way with the original “Welcome Back, Kotter” theme performed by John Sebastian.  

BREAKING: In the disappearance of Nancy Guthrie (south of Tucson), authorities say a person of interest has been detained for questioning — early reports are still developing, and officials have not fully confirmed details publicly.  

Even more breaking: the FBI releases chilling images/video of a masked individual appearing to tamper with the door camera the night Nancy vanished — and investigators say the footage was recovered from previously inaccessible “back-end” data with help from private-sector partners.  

Developing updates on the detention, what the newly released images show, and what comes next as the investigation intensifies