Niagara Gazette — "At 10 a.m., a party showed up at (police headquarters) and said he had information about the missing girl," Thomson said.
The person Thomson was referring to was Best and he then led police to the trash can in the alley behind 531 Third St.
"(Isabella's body) was in a trash can, under some other bags of trash," Thomson said. "Her body was inside a trash bag."
While Freeman had reportedly denied harming the child, detectives said Best confessed that he had helped his friend dispose of Isabella's body.
"It would have been very difficult to solve this without (Best's help)," Thomson said. "I imagine his conscience was bothering him."
Investigators said, based on statements made by Freeman and Best, they believe Isabella was killed in her great grandmother's home and that her body was then taken to the trash can. Detectives said they believed Freeman was the killer and Best helped to dispose of the body.
Thomson said there were some signs of trauma on Tennant's body, but "no evidence of sexual abuse."
In a statement released Monday night, detectives said, "At this time we believe Freeman killed Isabella with his bare hands and that Best was only involved after she was deceased."
An autopsy to determine the exact cause of Tennant's death is set for this morning.
In response to questions about why police did not issue an Amber Alert for Tennant, investigators said there are specific criteria that have to be met before an alert can be posted.
"You have to know there was an abduction and we didn't know if that was the case," Capt. Frank Tedesco said. "There was no sign that (Tennant) had been forcibly taken from the home. You also have to know there is a possibility of danger to the child."
Investigators said they had begun preparing a request for an Amber Alert, but dropped it when evidence showed Tennant had been killed.