Investigators believe the man who killed 5-year-old Allison Griffor of West Ashley two years ago is behind bars for another crime but they lack the evidence to charge him with the little girl’s death.

Griffor was fatally shot during around 1 a.m. Oct. 25, 2011, in what was believed to be an attempted home invasion at 1733 Pierpont Avenue.

“We feel confident that we know who did this and they are serving time,” Charleston County Sheriff’s Maj. Jim Brady said Thursday.

Investigators lack evidence to bring charges and are asking for help, Brady said.

Anyone with information is asked to call investigators at 202-1700 or leave an anonymous tip with Crime Stoppers at 554-1111.