Orlando, Fla. ? The mother and prime suspect in the disappearance of a 2-year-old boy said her parental shortcomings led her to suicide, according to a letter released by investigators Tuesday.

“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.

Police said Duckett killed herself with a shotgun at her grandparents’ home Sept. 8, nearly two weeks after she reported her son, Trenton, was 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.

Tips from national news coverage on Grace’s show and “America’s Most Wanted” have set off searches of nearby areas and in the Ocala National Forest but turned up no sign of the boy.

A suicide note released Saturday was addressed to the public, saying she ended her life after facing ridicule and criticism.

Duckett said the boy was “all I was breathing for” and she was misunderstood. “This is a last minute idea, but I have felt myself sinking after 1 week mark of Trent being gone,” she wrote.

Duckett told police she went to check on Trenton in his bedroom on Aug. 27 and found an empty crib and a 10-inch cut in the window screen above it. Authorities narrowed their focus on Duckett after finding some of Trenton’s toys, photographs and a sonogram photo in a trash bin in her apartment complex a day after he was reported missing.

The day before Duckett shot herself, she had a contentious interview with Grace. Grace and guests criticized the mother for refusing to disclose her whereabouts before Trenton disappeared.

Grace released a two-sentence statement Tuesday through a spokeswoman saying:

“Ms. Duckett’s notes do not change what should be everyone’s top priority: helping find Trenton Duckett and bring him home safe and sound, if that is still possible.”