A 22-year-old Georgia resident is accused of stalking and fatally shooting an estranged girlfriend while she was at work on Monday night. 

According to DeKalb County police, Quantez D’Ante Tyre waited for Tyrika Terrell, 22, outside her job at the United States Postal Service and opened fire.

Terrell worked as a United States Postal Service city carrier assistant for less than a month and was found underneath a USPS truck, reported The Atlanta Journal-Constitution. Tyre and Terrell share a 6-month-old daughter.

Tyre has a history of domestic abuse and was sentenced to 12 months of probation after pleading guilty to beating an ex-girlfriend.

Terrell’s mother, Eugenia Terrell-Grant, told Channel 2 Action News she received a phone call from Tyre on the night of her daughter’s murder.

“I can’t imagine what was going through his head. Why would you want to take the mother of [your] child?” Terrell-Grant told Channel 2.

On Monday, a truck driver discovered Terrell’s body and first thought she was hit by the USPS truck due to the location of her body. After authorities were alerted, Terrell was taken to Grady Memorial Hospital, where she was pronounced dead.

Terrell-Grant told Channel 2 she didn’t make it to the hospital in time to say goodbye.

“‘Rika,’ as we affectionally [sic] called her, was rushed to the hospital — but there was nothing doctors could do,” Terrell-Grant wrote in a GoFundMe post. “Now as a grandmother, I am forced to have to raise my granddaughter on my own. I will be forced to explain why mommy isn't coming home.”