Trenton's mother, Melinda Duckett, killed herself with a shotgun at her grandparents' home Sept. 8, nearly two weeks after she reported Trenton had been snatched from his bedroom. She had been under intense media pressure, including with CNN Headline News' Nancy Grace, who questioned the validity of her story.
Investigators say they've now narrowed the timeline of when Trenton disappeared to a roughly 30-minute period on Aug. 27 in Marion County. They say there may have been a "conspiracy" between Trenton's mother and another party to keep the boy away from his father.
Marion County Sheriff's Captain James Pogue said he believes the boy is alive because no one has proven otherwise. Pogue encouraged people across the country to look at every toddler to see if it may be Trenton.
The boy's father, Joshua Duckett, says he's "100 percent confident" his son is OK, adding that "it's just a matter of finding him."
"The main reason I'm doing this is because even after my baby is found, I would not be a good mother with two jobs and full-time school," 21-year-old Melinda Duckett wrote in the note addressed to her grandparents.
A shorter note, also released Tuesday, was addressed to her parents and asked them not to bother trying to understand her.
Authorities focused on Melinda Duckett after some of Trenton's toys, photographs and a sonogram photo were found in a trash bin in her apartment complex a day after he was reported missing.
The testimony from an employee at a Wendy's restaurant in Belleview, Fla., has opened up a new, parallel investigation by the Marion County Sheriff's Office.