In February, the second letter sent to the media regarding Nancy Guthrie ‘s abduction indicated that the retired grandmother was killed shortly after she was taken from her Arizona home earlier this year, according to multiple reports on Monday. Nancy Guthrie, the mother of longtime Today host Savannah Guthrie , was reported missing after she disappeared from her Tucson home on Feb. 1. Evidence indicated she was taken from her home where she lived alone. The frantic hunt for the 84-year-old quickly became a national news story; still, as weeks passed, very little new information came in days after she vanished.  On Monday, both NBC News and ABC News reported that the second letter received by local media outlets indicated that Nancy Gutherie was dead. The networks cited sources familiar with the investigation. Both letters were sent within days of her vanishing.  A week later, on Feb.…