Tracy Jones and Michael Kelly of Macon and Courtney Kelly of Warner Robins are in the Bibb County jail charged with felony murder, jail records show.
Macon Police confirmed that 58-year-old Gail Spencer died of suffocation.
Two women and two men have now been charged with murdering Spencer. Three of the suspects--Tracy Michelle Jones and Michael Brett Kelly of Macon, and Courtney Nicole Kelly of Warner Robins--were denied bond Wednesday and will stay in jail for now.
The fourth suspect--Keith Anthony Dozier of Warner Robins--was arrested early Thursday morning.
Macon police held a news conference Wednesday morning to announce the arrests, but released few other details in the case.
Police say all four are charged with felony murder for killing Spencer whose body was found early Saturday in her home on Stinsonville Road.
According to a police report, a neighbor called the authorities because they had arranged for Spencer to help with their dog while they traveled out of town. But when they returned, the dog was still outside.
The neighbor also said Spencer's blinds were drawn and lights were on, which was unusual. The dead bolt was locked, according to the police report, and the door and windows were cold.
At that point, the officer on scene, who knocked on the front and back doors with no answer, called the fire department for help getting inside.
Spencer's body was found in the back bedroom.
Police Chief Mike Burns said investigators initially found no visible injuries on Spencer's body.
He said autopsy results that came back Tuesday showed that her death was a homicide. He did not explain.
He also did not describe the relationship among the three suspects and the victim.
But a law enforcement official told 13WMAZ that Tracy Jones and Gail Spencer worked together in the office of Macon lawyer Calder Pinkston. He said the two Kellys are brother and sister.
The official said he believed the motive was money.
Pinkston confirmed Tuesday night that Spencer worked in his office, but declined further comment.
Jail records show that Tracy Jones was booked Tuesday night and the two Kellys early Wednesday.
After friends called 911 to report Spencer missing, Macon-Bibb firefighters found her body around 3:30 a.m. in her home at 3475 Stinsonville Road, coroner Leon Jones said.
He told 13WMAZ that Spencer's car was also missing. Her car is a silver 2004 Acura Integra TSX, Jones said, with a Georgia license plate of PDF 3869.
Tuesday afternoon, a car matching the description of that missing vehicle was located in the parking lot of Porterfield Baptist Church off Allen Road in south Macon. In the news release, Hofmann confirmed that the car belonged to Spencer.