Ga. 911 Caller: "My Whole Family is Dead!"

Updated at 3:40 p.m. Eastern time

A frantic caller told authorities he had just come home to find several relatives apparently beaten to death and another barely breathing, according to a 911 tape released Monday from the weekend attack at a mobile home park in southeastern Georgia.

"My whole family is dead!" screamed Guy Heinze Jr., 22. "It looks like they've been beaten to death. I don't know what to do, man."

When authorities arrived Saturday morning, they found seven people dead and two clinging to life. Police have refused to say how they were killed or give a possible motive. An eighth person died Sunday. CBS News affiliate WTOC in Savannah reported Monday morning that the sole surviving victim is in critical condition.

"We still believe there is a person or persons responsible for this somewhere out there, and we're looking for them," Glynn County Police Chief Matt Doering said Monday.

Police have refused to say how they were killed or why and have said they don't know if the killer or killers are still in the area. Heinze was arrested on drug and other charges but police have not called him a suspect in the slaying.

On the 911 call, Heinze said his father, uncle and cousins were among the dead. After handing off the phone to an employee at the mobile home park, Heinze apparently returns to the trailer and is overheard on the call screaming that his cousin Michael, who had Down syndrome, was still breathing and that his face was "smashed in."

"Michael's alive, tell them to hurry!" Heinze said. "He's breathing! He needs help!"

Police on Sunday said one man rescued at the scene, 19-year-old Michael Toler, had died at a Savannah hospital.

Police have said the killer was not among the dead or the last survivor. They also said they have no evidence to suggest that suicide was involved.

Neighbor Margaret Orlinski, who called 911 after Heinze came screaming to her home, told a 911 operator that a baby also lived in the mobile home where the victims were found.

"I know there's a little baby," Orlinski says on the recording. "Shoot, there's a little babe. I don't know if the baby was in there or not."

Heinze doesn't mention a baby on the 911 recording. Police have declined to give ages of the victims, but Doering has said there were "no infants" among them.

Police have arrested Heinze, the 911 caller, on suspicion of tampering with evidence, lying to police and illegal possession of prescription drugs and marijuana. He was jailed Sunday.

Asked if Heinze was involved in the slayings, Doering said Sunday: "I'm not going to rule him out, but I'm not going to characterize him as a suspect."

Police acknowledged they don't know if the killer was still out there, urging residents to be aware and cautious.

"The person or persons responsible for this still remain unknown to us," Doering said Sunday, adding the killer could have fled to another county or even another state. "I cannot tell you if they are at large. I simply do not know."

The uncertainty has created fear among some in the town.

Resident Toni Mugavin said she wonders if she needs to sleep with a gun under her pillow, afraid the killer is still on the loose. Mugavin expressed frustration with the lack of information about what happened.

"There's no manhunt, no suspect," said Mugavin, 50. "There's nothing specific they're telling us."

Earlier, Doering said it was the worst murder case he had ever encountered in his 25 years with the county that includes Brunswick, a city of about 16,000 people between Savannah and Jacksonville, Fla., along Georgia's southeastern coast.

The slayings happened in a mobile home park on the grounds of a historic plantation, nestled among centuries-old, moss-draped oak trees. The park consists of about 100 spaces and is near the center of New Hope Plantation, according to the plantation's Web site.

The 1,100-acre tract is all that remains of a Crown grant made in 1763 to Henry Laurens, who later succeeded John Hancock as president of the Continental Congress in 1777.

The Georgia Bureau of Investigation was conducting autopsies Sunday on four of the victims. GBI spokesman John Bankhead said Glynn County police would be in charge of releasing any results, and Doering refused to comment on them. He said autopsies on the remaining four victims were to begin Monday.

Doering defended his vague statements about the case, saying he didn't want the public to know details that might compromise what he called a "tedious" investigation.

Still, the dearth of information has frustrated residents, said Mary Strickland, who owns The Georgia Pig, a popular local barbecue place.

"We got a lot of people who panic and the more information you put out there, the better you make them feel," Strickland said.