The investigation into Nancy Guthrie's mysterious disappearance continues, prompting law enforcement to seal off areas near her Tucson home. Guthrie, 84, has been missing since February, with authorities uncovering blood at her residence, heightening concerns for her health. She is known to need daily medication, including a pacemaker. Investigators are combing through numerous tips and have released surveillance footage showing an armed, masked individual outside her home just before her disappearance. Officials emphasize that this video could be pivotal in solving the case.