The investigation into the disappearance of 84-year-old Nancy Guthrie remains active and ongoing.

Forty-two days have passed since the grandmother was last seen, with officials still pursuing leads and analyzing DNA evidence.

So far, though, no specific suspects or persons of interest have been publicly named. The Pima County Sheriff's Department has scaled back some efforts, such as the use of cadaver dogs, but Sheriff Nanos says they will be brought back in if necessary.

The family is offering a $1 million reward.

The FBI is seeking tips regarding the disappearance of Nancy Guthrie and urges the public to call 1-800-CALL-FBI or submit information online at tips.fbi.gov.