Investigators believe someone deliberately set the house on fire, and there was evidence that the elderly victim struggled with someone.
A housekeeper was initially arrested, but was quickly exonerated and released. No one else has been arrested.
"It is very frightening, it's very frightening because she's a defenseless little lady, a little old lady, and I am afraid," said neighbor Jacqueline Jackson.
Firefighters found Mosley's body in a pool of blood in her kitchen after a fire at her home was put out.
Mosley lived at the home with her daughter and her teenage grandson.
Friends and neighbors are shocked and stunned by what happened.
"She was so nice, she didn't do anything to anybody. She was as sweet as she could be. And I never knew yesterday that something like this was going to happen to her. It's sad because a she's a grandmother. She was so nice. She used to babysit my nephew," said Mosley's close friend Sandy Hayes.