Miller, Elisa
Investigators now suspect the mother, Leisha Jones, killed her children.
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Medical evidence suggests that Staten Island mom Leisha Jones - and not 14-year-old son C.J. - killed the family in a fiery murder-suicide last week.
No soot was found in the teenagers lungs, indicating he was already dead from a slit throat when the inferno was set, sources said.
There was soot in the lungs of the mother and her 2-year-old son, Jermaine, showing they died of smoke inhalation.
Police initially believed C.J. had set the fire and slashed the throats of his two sisters before slitting his own throat with his mother's straight razor.
But cops changed their mind after a charred note at the scene with the words "am sorry" proved to be in the mom's handwriting.
Ever since Thursday's blaze, C.J.'s father, Earlston Raymond, who lives in Jamaica, has said he believed the mother did it.
The NYPD has not officially declared Jones the killer.
But sources said detectives believe she used the razor to kill daughters Melanie, 7, and Brittany, 9. C.J. was also slashed, but pills were found in his stomach, and a cause of his death has not yet been determined.
Jones also had pills in her stomach.