India, July 4 -- As the investigation into Nancy Guthrie enters its fifth month without any updates regarding suspects, a man from California has admitted guilt for sending a fraudulent ransom note and for harassing the 84-year-old's daughter, Annie Guthrie, along with her son-in-law, Tommaso Cioni.

According to KVOA, a local NBC affiliate, 42-year-old Derrick Callella has pleaded guilty to two felony charges: one for transmitting a ransom demand across state lines and another for using a telecommunications device to threaten or harass. He is required to complete five years of probation and is set to be sentenced on September 10.

Callella, hailing from Hawthorne, California, was apprehended shortly after Nancy's disappearance on charges...