The East Cobb man still wanted in the death of his ex-wife over the weekend sent threatening e-mails to her earlier this year, shortly before he was jailed for stalking her, police said.
According to The Atlanta Journal-Constitution, John Kristofak sent several e-mails to Donna Kristofak between March 9 and 19 threatening to harm and even kill her.
The newspaper reported Monday the harrowing details of an arrest warrant issued for him on March 28.
Kristofak was arrested the following day for aggravated stalking after an incident involving her at a Wal-Mart parking lot, according to the AJC report.
Donna Kristofak died Saturday after suffering injuries during an attack on her home on Tall Pine Drive, near Walton High School.
Cobb Police have issued murder and aggravated assault warrants for John Kristofak, who was last seen driving a brown Chevrolet Equinox with Georgia tag BUV 2635.
Kristofak, 58, is considered armed and dangerous, and police are urging anyone who may see him to call 911.
The AJC report said that in the March warrant, Kristofak warned his ex-wife "never [to] cut me off from my children. You did and you will pay."
In his final e-mail to her on March 19, the AJC reported that Kristofak told Donna Kristofak to "make your final goodbyes with your children.”
The Marietta Daily Journal quoted a neighbor as saying that John Kristofak served several months in jail on the stalking charge, but that the case was dropped in October after a hearing in Cobb Superior Court.
The Kristofaks had three sons, Michael, Harrison, a senior at Dominion Christian School in Marietta and Zac, a freshman at Walton.
Cobb Police have said very little about the case, declining even to describe how Donna Kristofak was killed, and didn't release news of the murder until more than 24 hours after it occurred.
An acquaintance of John Kristofak told Patch he was shocked when he learned that someone he had known "for years" via East Cobb youth sports circles and whose son he had coached in youth baseball was the suspect in a murder.
The MDJ report said Harrison Kristofak is a varsity basketball player at Dominion Christian and formerly attended Walton.
Zac Kristofak is listed as a member of the Walton boys freshman basketball team. On social media channels, friends, schoolmates and others offered prayers and condolences to him and his family.
A Walton junior varsity basketball player, Jeremiah Bivins, tweeted on Sunday night: "Walton basketball teams hoopin for the kristofaks."
Others sent their messages on the #PrayForTheKristofaks Twitter hashtag.
On his own Twitter account Monday morning, Zac Kristofak thanked the well-wishers and asked for more prayers. He also tweeted:
"It can't be Christmas eve..."