Homicide detectives in Nassau County shared new information about a decades-old cold case.

Susan Mann was 15 years old when she was last seen in Queens back in May 1980.

Two years later, her decomposing body was found in a dumpster in Freeport.

Detectives believe Mann was buried and moved from a location where she was buried sometime in 1980 and brought to the dumpster where she was found in 1982.

After her body was found, she was buried as a 'Jane Doe,' but police say her body was recently identified with 'investigative genealogy.'

Detectives say Mann was last seen wearing a striped top, blue jeans and sandals, and riding a bike that was never recovered.

Detectives want to hear from anyone who may have seen her in the Freeport area between 1980 and 1982 or who would have information that would lead to a suspect.

"We're looking for anybody that would have known her, would have been in the Freeport area during that time in '80 to '82 or anybody that thinks they have some kind of information that would lead to a suspect or an investigative lead to an arrest," Commanding officer of the Nassau County homicide squad, Stephen Fitzpatrick, said.