The Jacksonville Sheriff's Office announcing Friday afternoon they do believe foul play was involved, as they've recovered what they believe to be the body of 53-year-old Kristina French in the backyard of a Neptune Beach home connected to the two.
Ron Lendvay, a director of investigations and homeland security for the sheriff's office, said surveillance footage from a gas station in south-central Pennsylvania picked up the image of the teen and Dodge Dart on Thursday afternoon.
Authorities emphasized Mott is only a person of interest in the case - not a suspect - and they're looking to 'talk to him about what happened at the house'.
WJXT in Jacksonville first reported both Mott and French went missing on Wednesday after failing to pick up Mott's father at the Jacksonville International Airport.
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Logan Mott and his grandmother Kristine French were no where to be found.
"Regardless, Logan is our tyke and we cherish him... We want to find out what happened to Kristina and we need time for that to happen", the mother said.
The teen is considered armed and risky, and police have advised the public against approaching him or the vehicle. French's home in the Mayport area also was ransacked. Officials are waiting for an autopsy for a positive identification.
Police issued an arrest warrant for Mott earlier on Friday on charges of auto theft.
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In a statement, Campbell-Mott she was "relieved" that her son was in custody.
And considering the missing guns, he was considered armed and risky. "Mom", Campbell-Mott said in the post. "I'm here. I love you".
The boy is a student at Sandalwood High School in Jacksonville.
Campbell-Mott said she last spoke to Logan on Sunday and that he seemed to be in a good mood.
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