In a frantic 911 call early Aug. 29, Heinze had told a dispatcher "My whole family's dead!"
Hours after the bodies were found, Heinze was charged with evidence tampering, lying to police and drug possession. But police didn't say until Friday that they suspected him of the killings.
He had been briefly released on bond related to the lesser charges and arrested again later Friday.
"It's my understanding that there was physical and testimonial evidence," said Candice Temple, a spokeswoman for the Glynn County police. Heinze was being held at the county detention center.
Temple declined further comment, but authorities were holding a news conference later Friday night.
The slayings occurred at the New Hope Plantation mobile home park a few miles north of the port city of Brunswick.
The dead included the suspect's father, Guy Heinze Sr., 45; his uncle, Rusty Toler Sr., 44; and his aunt Brenda Gail Falagan, 49. Also slain were Toler Sr.'s four children -- Chrissy Toler, 22; Russell D. Toler Jr., 20; Michael Toler, 19; and Michelle Toler, 15.
Chrissy Toler's boyfriend, Joseph L. West, 30, was also killed.
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