The Pima County Sheriff's Office says it recently learned of the note along with social media comments about it. Investigators are now working with the FBI to determine whether it's authentic, and the contents have not been released to the public.
A masked intruder was caught on a doorbell camera lurking at Guthrie's front door before the abduction, and the FBI released footage of the suspect in hopes someone could identify him. The case has drawn national attention, with investigators piecing together fragments of evidence in hopes of finding Guthrie.
For Guthrie's family and for Tucson residents watching the case unfold, a possible ransom note is the first new lead in weeks. It could mean someone involved is trying to make contact, or it could turn out to be a hoax feeding off public interest in the case. Either way, authorities aren't taking chances, running the note past federal investigators before saying anything more.