Police in Tennessee say the mother of super middleweight world champion Caleb Plant was fatally shot after pulling a knife on an officer.

The Tennessee Bureau of Investigation says in a statement that 51-year-old Beth Plant was pronounced dead on Saturday at a hospital. It says Plant became “combative” while being transported by ambulance and pulled out a knife. The driver called law enforcement and an arriving deputy shot Plant when she brandished a knife at the officer, according to the report.

CalebPlant (@SweetHandsPlant) Love you forever and always momma . You always said “work hard bubba” and I did. All you needed was help with your demons... your free now momma🖤 pic.twitter.com/kqgYOg4Bkc

“Love you forever and always momma,” wrote Caleb Plant on Twitter on Sunday. “You always said ‘work hard bubba’ and I did. All you needed was help with your demons... your free now momma.”

Plant won the IBF’s super middleweight title in January after a unanimous points victory over Jose Uzcategu. He dedicated his victory to his daughter, Alia, who died in 2015.