Judge C. Creed McGinley said he was grateful the plea will spare Bobo's family from the ordeal of another trial.
Holly Bobo was last seen in April 2011 walking into the woods behind her Pasons, Tennessee home with a man dressed in camouflage.
Dylan Adams' brother, Zach Adams, was convicted of kidnapping, raping and murdering Bobo in September and sentenced to life in prison plus 50 years.
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In 2017, the first defendant, Zachary Adams was found guilty of the rape, kidnapping and murder of Holly Bobo.
Prosecutors have not publicly revealed the details of John Dylan Adams' involvement, but Shelby County Assistant District Attorney Paul Hagerman did say Monday that he had less involvement than his older brother.
John Dylan Adams acknowledged that prosecutors had evidence to convict him of kidnapping Holly Bobo.
Adams is pleading to facilitation of first-degree murder for 15 years and especially aggravated kidnapping at 35 years to run concurrently.
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Jason Autry, who is also accused in the case and testified against Zach Adams, has already reached a plea deal in the case.
Bobo's mother Karen told the court at Zachary's hearing that her daughter was a loving person who 'appreciated the small things in life'.
"I know no one is happy about this, but at least we can avoid a lengthy, expensive, emotional trial", a judge said after announcing the plea deal. Austin committed suicide in Florida in February 2015.
Autry said he served as a lookout while Zachary Adams shot Bobo under a bridge spanning the Tennessee River. At the time, Cooper was about to be transferred to the same jail where John Dylan Adams was being held.
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Adams' trial date has been set for May 29.