YULEE, Fla. — Authorities are searching for evidence of a missing Florida woman in a landfill near the Florida-Georgia line.

The FBI, sheriffs from Nassau County, Florida, and Charlton County, Georgia, and Florida prosecutors held a news conference Monday on the May disappearance of 34-year-old Joleen Cummings. Authorities say they believe she is dead.

Agents and deputies have spent three days sifting through garbage at a landfill in Folkston, Georgia. Officials didn’t say if anything significant was found.

Cummings was reported missing after she failed to appear at a Mother’s Day birthday celebration with her three children.

Nassau County Sheriff Bill Leeper has named Kimberly Lee Kessler, Cummings’ co-worker at a salon, as a suspect. Kessler has been charged with stealing Cummings’ Ford Expedition, which was found abandoned several days after her disappearance.