Police in Chatham County, Georgia, announced Thursday on Facebook and Twitter that 20-month-old Quinton Simon, who was reported missing by his mother Leilani Simon on Oct. 5, has most likely died.

Police did not release details as to why they believe the boy is dead or how he died.

"We know thousands of people around the world will be heartbroken by this news, and we share your sorrow," read a police statement.

Investigators said Wednesday that the toddler's mother, Leilani Simon, is a prime suspect. Charges have yet to be filed and no arrest has been made.

Investigators also announced they contacted the boy's biological father and said he was not likely involved in the boy's disappearance.

Quinton Simon had lived with his mother, her boyfriend, his grandparents, and two other children in Savannah, Georgia. Chatham County Police Chief Jeffrey Hadley told CBS affiliate WTOC in Savannah that he was "very concerned" about the boy's disappearance.

The 40 FBI personnel joined the search the following day, police chief Hadley confirmed in a press conference. After searching the toddler's home, they also said in Tuesday's press conference evidence was found that would break open the case.