Teen who's person of interest in grandmother's death to appear in court, remains positively IDd

PHOTO: Logan Mott, 15, is pictured in this undated photo.PlayJacksonville Sheriff's Office
WATCH 9th-grader in custody is person of interest in grandmother's death

The hearing for a 15-year-old boy who’s considered a person of interest in connection to the death of his grandmother has been postponed until Wednesday.

Logan Mott -- who was found Friday in Buffalo, New York, -- is set to appear for an extradition hearing in Erie County Family Court in upstate New York.

Neptune Beach, Florida, police found a body in a shallow grave Friday afternoon in the backyard of a home belonging to Logan Mott's father. Mott also lives at the home.

PHOTO: The Jacksonville County Sheriff’s Office has confirmed the body found in a shallow grave in the backyard of a Logan Motts home in Neptune Beach Florida has been positively identified as Motts grandmother, Kristina French, 53.WJXX
The Jacksonville County Sheriff’s Office has confirmed the body found in a shallow grave in the backyard of a Logan Mott's home in Neptune Beach Florida has been positively identified as Mott's grandmother, Kristina French, 53.

PHOTO: The Jacksonville County Sheriff’s Office has confirmed the body found in a shallow grave in the backyard of a Logan Motts home in Neptune Beach Florida has been positively identified as Motts grandmother, Kristina French, 53.WJXX
The Jacksonville County Sheriff’s Office has confirmed the body found in a shallow grave in the backyard of a Logan Mott's home in Neptune Beach Florida has been positively identified as Mott's grandmother, Kristina French, 53.

The Jacksonville County Sheriff’s Office said today the body has been positively identified as Mott's grandmother, Kristina French, 53.

PHOTO: The Jacksonville County Sheriff’s Office has confirmed the body found in a shallow grave in the backyard of a Logan Motts home in Neptune Beach Florida has been positively identified as Motts grandmother, Kristina French, 53.WJXX
The Jacksonville County Sheriff’s Office has confirmed the body found in a shallow grave in the backyard of a Logan Mott's home in Neptune Beach Florida has been positively identified as Mott's grandmother, Kristina French, 53.

PHOTO: The Jacksonville County Sheriff’s Office has confirmed the body found in a shallow grave in the backyard of a Logan Motts home in Neptune Beach Florida has been positively identified as Motts grandmother, Kristina French, 53.WJXX
The Jacksonville County Sheriff’s Office has confirmed the body found in a shallow grave in the backyard of a Logan Mott's home in Neptune Beach Florida has been positively identified as Mott's grandmother, Kristina French, 53.

"He adamantly denies any involvement in his grandmother's death and he's very upset about it," Dominic Saraceno, a lawyer hired by Mott's family, told ABC News.

Saraceno said he spoke to Mott at the Erie County Youth Services Center, the detention center where he is being held on a grand theft auto warrant.

"My understanding is he has no history of crime, he's a ninth-grade student, he's a good student, he's well-liked by his classmates. And the only type of medication that he is on is for juvenile diabetes," the lawyer said.

PHOTO: Logan Mott in an undated photo provided by the Jacksonville Sheriffs Office. The teen was captured Nov. 24, 2017 trying to enter Canada following the discovery of his grandmother in a shallow grave at his Florida home.Jacksonville Sheriffs Office
Logan Mott in an undated photo provided by the Jacksonville Sheriff's Office. The teen was captured Nov. 24, 2017 trying to enter Canada following the discovery of his grandmother in a shallow grave at his Florida home.

U.S. Customs and Border Protection (CBP) officials encountered Mott driving Friday evening at the Peace Bridge near the center of downtown Buffalo after he made a wrong turn onto the bridge.

The officers took him into custody "without incident" after a primary inspection revealed he was the subject of a warrant for grand theft auto in Florida, according to CBP public affairs liaison Aaron Bowker.

ABC News' David Caplan and Dean Schabner contributed to this report.

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