ROMULUS, Mich. -- For months her killer has been out there, and Rescue 4 revealed on Thursday that Romulus police may be closer to solving the slaying of 7-year-old Raven Jeffries, who was killed last summer.

Jeffries' mother, Brenda, said she recently discovered a video on her cell phone that she did not know was there, and it was filmed by Raven. The video was shot the same day Raven disappeared and it shows her singing and dancing.

Brenda Jeffries shared the video with Local 4 while standing in a memorial garden that she dedicated to her daughter.

"With this here people will see that, that this is how much I'm grieving over my daughter," she said of her memorial.

Police said the 7-year-old's badly burned body was discovered a few days after she was reported missing last August, and her mother said she knows who did it.

"They're not going to get away with it. Not as long as I'm living," she said. "I don't understand how anybody could do this to a child and not even have no remorse. They have no remorse at all."

Romulus police Detective Dwayne Decaires said he has been on the case from the very beginning, working daily to try and solve it.

"I've been doing this for over 20 years. This will be the one case that will stick with me for the rest of my career and probably the rest of my life," he said. "The person that's able to do this is not just violent and cruel but just a very evil person. "

Officials said the results of DNA samples sent to labs in Quantico, Va., and the Michigan State Police are expected back at the end of May.

Tips generated from America's Most Wanted confirm what police said they suspected.

Police said the suspect list has also narrowed considerably.

A memorial fund was established for Raven Jeffries and contributions can be made at any Comerica Bank location.