A stay-at-home mother from Tennessee has shot to death her four adopted children and then herself in what officials are calling a murder-suicide.

Maury County Sheriff Bucky Rowland told a news conference on Tuesday his detectives are still trying to figure out a motive behind the domestic tragedy that took place in Columbia on Monday.

Rowland identified the dead as 55-year-old Cynthia Collier, 14-year-old Bo Li, 14-year-old Meigan Lin, 15-year-old Lia Lin and 17-year-old Kaileigh Lin.

Scene of carnage: Officials in Tennessee say Cynthia Collier, 55, shot and killed her for adoptive children, ages 14-17, before taking her own life inside the family's Columbia home (pictured)

The victims' bodies were found in different rooms on the Collier family's property in the 1000 block of Carters Creek Pike

He said the teenage victims had been adopted and home-schooled in what appeared to be a loving home.

Collier's adult biological son found the bodies of his mother and step-siblings and called police after returning home from work at 6pm.

The victims were scattered throughout the family's residence in the 1000 block of Carters Creek Pike in Columbia. Two firearms believed to be the murder weapons were recovered from the scene.

Maury County Sheriff Bucky Rowland speaks to the media about the quadruple murder-suicide on Tuesday

'We deal with carnage,' Rowland said. 'The magnitude of this...it was more than what we’re used to on a day-to-day basis.'

Collier's 58-year-old husband and the victims' adoptive father was not home at the time of the slaughter.

The sheriff's department has no record of service calls to the house, which Rowland described as 'immaculate.'

Records indicate the Collier family had purchased the million-dollar property down the road from a cemetery in 2014.

Their neighbors told Fox 17 the Colliers were 'exceedingly private.'

The sheriff said there is reason to believe the mother was struggling with mental health issues.