The two suspects remain at large, police said.
Elizabeth Hutcheson, 27, was found by police around 9:15 p.m. bleeding in the doorway of the Thompson Street home, according to Cedartown Assistant Police Chief Jamie Newsome.
Hutcheson suffered multiple stab wounds and had been bludgeoned, he said.
She was pronounced dead at Polk Medical Center.
"It's been 15 to 18 years since we've had a something this violent," Newsome said.
Newsome said police believe the suspects, Cadedra L. Cook, 18, of the residence, and a 15-year-old juvenile ordered a pizza from Dominos and killed Hutcheson when she delivered it.
Murder warrants have been issued for both, but police have not yet found either. A picture of the juvenile was not available as of Friday morning.
Police do not have a motive and do not know if drugs were involved, he said.
"I feel rather confident we know what happened. We don't know why," Newsome said.
He said police discovered Hutcheson by chance just moments after the attack.
"Cedartown police was working a traffic stop in the 100 block of Thompson Street and officers heard frantic screaming," he said. "They could tell it was something serious so they abandoned the traffic stop to go find it."
Newsome said the Georgia Bureau of Investigation has assisted the city in the case from the beginning and Cedartown is also receiving help from the Polk County Police Department and the Polk County Sheriff's Office.
Newsome asks that anyone with any information about the whereabouts of the two suspects, please call the CPD directly at 770-748-4123
Read more: RN-T.com - Cedartown delivery worker is stabbed to death police searching for 2 suspects