ATHENS, Ga. -

A preliminary autopsy shows the death of a 22-year-old University of Georgia student was not a homicide, but authorities still don't know why she died.

Rebecca Greene’s body was found Tuesday morning in a creek about a mile from her Athens home.

Authorities began searching for Greene, a Brunswick High School graduate, after her boyfriend reported her missing when she didn't return home from class on Monday night.

Officers found her body in an area around The Plaza in Athens after they were able to ping her cellphone's signal at about 10:30 a.m.  Her phone and bicycle were found nearby.

Greene's body was sent to the Georgia Bureau of Investigation's crime lab in Decatur.  GBI investigators said Tuesday night that the manner of death was not a homicide and an autopsy on the woman didn't show any signs of foul play. The cause of death remained unclear.

Channel 4 went to Greene’s neighborhood in Brantley County Tuesday night and found neighbors who know the Greene family. The Myers family, who lives on the next street over from the Greenes in Hortense, said they were shocked to learn about Rebecca’s death Tuesday.

“She was just the sweetest person ever,” said Hannah Myers.

“The Greenes are some of the best people that there are, this is not something I would have ever expected,” said Raymond Myers. “I believe she was preparing to go abroad and spend some time outside of the United States, again, involved in some charitable works.”

That charitable work is something the Myers family told Channel 4 the entire Greene family took part in.

“It’s unbelievable how much time they spend in doing nothing but supporting other people, works in the ministry, particularly in Haiti, that’s like their stomping ground,” said Raymond.

“We're definitely going to get a lot of people praying for them in this time," said Hannah. "And I'm sure there will be a lot of people bringing things to them, doing their shopping for them, doing their cooking for them.”

The GBI said it will take several more days, possibly weeks, before they have any more answers. Anyone with any information is asked to call the Crime Stoppers Tip Line in Georgia at 706-613-3342.