The mother of mass school shooter Colt Gray had threatened to kill her estranged husband less than a year before their son gunned down four people at Apalachee High School in Georgia, DailyMail.com can exclusively reveal.

Marcee Gray, 43, has a criminal record spanning more than 17 years, and was in jail as recently as April, court records show.

The former quality engineer was arrested in November in Barrow County, suspected of possessing methamphetamine, fentanyl and muscle relaxants. 

She also faced charges of aggravated battery, theft by taking, criminal trespass, false imprisonment and failure to appear in January, in nearby Fitzgerald County.

Sources told DailyMail.com that the mother-of-three ‘threatened to kill her husband’ during one of the incidents.

She also ‘tied up’ her elderly mother and left her for 24 hours.