Boswell was last seen in December 2019, but she was not reported missing until February.
WJHL reports TBI and detectives with the Sullivan County Sheriff's Office searched a property belonging to a family member of Evelyn's mother, Megan Boswell, in northeast Tennessee.
We have a heartbreaking update in the search for #EvelynBoswell.— Tennessee Bureau of Investigation (@TBInvestigation) March 7, 2020
This evening, authorities found remains believed to be those of the missing 15-month-old. An autopsy is pending and the investigation remains ongoing.
Thank you for your support during this difficult process. pic.twitter.com/KxwpePiydT
Authorities said they found the possible remains of the 15-month old there.
WATCH: Tenn. Bureau of Investigation gives briefing after remains believed to be Evelyn Boswell found
"At this time, the investigation is still in the very early stages," Sullivan County Sheriff Jeff Cassidy said during a news conference Friday night. "There is a lot of work left to be done."
The TBI said an autopsy is pending and the investigation is ongoing.
In late February, investigators searched a mobile home park in Sullivan County, Tennesee, in connection with her disappearance.
A few days before, authorities searched a pond in Wilkesboro, North Carolina. That search proved "inconclusive."