The killings prompted a massive manhunt for 25-year-old Michael Cummins, who lived at one of the homes.
The TBI said four victims were found at the home and a fifth victim was at another home on Luby Daniels Road.
Police identified Cummins Saturday night as a suspect, leading to a search throughout the wooded area nearby.
Authorities say the man arrested in connection with five rural Tennessee slayings suffered non-life-threatening injuries after being shot while being capture by police.
Police say officers responding to a 911 call from a family member led to the original discovery of four bodies and an injured person at the first home.
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Police and the state Department of Labor and Industries were investigating, which Durkan said could take months. Gregg says a 28-year-old man is also being evaluated for non-life-threatening injuries at the center.
Weatherford said the bodies were found inside a house on Harve Brown Road between Portland and Westmoreland in a suburb, northeast of Nashville.
TBI located Cummins with its aircraft, in a creek bed about a mile from the first crime scene. A fifth, injured victim was also at the home, and transported to the hospital.
Details about a possible motive or how and when the victims were killed have not been released. Authorities say when the suspect Cummins was captured, he produced multiple weapons, prompting an officer to shoot him.
"TBI Agents and forensic scientists continue to gather relevant evidence and interviews in support of both the homicide investigations and the investigation into the officer-involved shooting", the TBI said. Cummins was taken to a local hospital.
A number of law enforcement agencies had been searching for Cummins, saying earlier that he could be armed and risky. Cummins was taken to a local hospital.