Kelly Frank pleaded guilty in the state's District Court July 11 to felony theft, misdemeanor obstruction and possessing illegally killed wildlife as part of the agreement.
In exchange, Teton County authorities dropped a felony charge of solicitation, which accused Frank of plotting to kidnap Letterman's baby son from the chat show host's Montana ranch.
Frank was arrested in March after a friend told police the handyman had hatched a plan to abduct Letterman's then 16-month-old son Harry.
The plea agreement calls for Frank to be sentenced to a 10-year term in prison on the theft charge, and five years on the wildlife possession charge. Official sentencing will take place in September.
Frank previously pleaded guilty to stalking and intimidating a woman who alleges he also kidnapped and raped her.
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