WXIA-TV in Atlanta reported that Walden called 911 after he had to wrestle his gun away from Erica Palmer, who was also armed with a baseball bat, with which she struck his companion in the arm and then ran away.
The Braselton Police report said Palmer reappeared as Walden was attempting to take the injured woman to the hospital and then allegedly slashed Walden's arm with a knife and ran again.
Police tracked Palmer's cellphone to a hotel, where she was arrested and being held without bail on two counts of aggravated assault, family violence aggravated assault, theft by taking and first-degree burglary.
A source told ESPN.com that Walden, who was treated at a hospital and released, is OK and that the slash was not severe enough to cause any major damage going forward.
Walden has 82 tackles and nine sacks over the last two seasons with the Colts. He also has played with the Green Bay Packers, Miami Dolphins and Kansas City Chiefs over his seven-year NFL career.
ESPN.com Colts reporter Mike Wells contributed to this report.
Report: Erik Walden Attacked By Ex
Colts linebacker Erik Walden was slashed in the arm with a knife after allegedly being attacked by his ex-girlfriend in Braselton, Georgia.