Officials say the seven people killed in two homes in rural Tennessee included the parents of the suspect and other relatives.
Law enforcement officials arrested 25-year-old Michael Cummins on Saturday about a mile away from one of the Sumner County crime scenes. Tennessee Bureau of Investigation Director David Rausch called the scenes "horrific" and "gruesome."
On Monday, TBI identified those killed as David Carl and Clara Jane Cummins, the suspect's parents; Charles Edward Hosale, his uncle; Rachel Dawn McGlothlin-Pee, whose relationship to him isn't clear; Rachel's 12-year-old daughter, Sapphire McGlothlin-Pee; and Rachel's mother, Marsha Elizabeth Nuckols. Another victim, Shirley B. Fehrle, was found in a separate home and has no known relationship to Cummins.
An eighth victim, another relative, remained hospitalized in critical condition.
Authorities say a sixth body has been found in a residence in rural Tennessee, bringing the death toll at two area homes to seven.
The Tennessee Bureau of Investigation said Sunday in a news release that forensic scientists working at the scene at a home near the community of Westmoreland found the sixth body.
Another victim's body was found at another home in the area Saturday. The state's top law enforcement agency believes the two scenes are related.
Efforts to identify the victims are ongoing.
A 25-year-old suspect was arrested Saturday after being shot and wounded by police.