Officers say one woman was shot. At last check, she was in stable condition.
We are told the woman was a customer of the store. Police say the gunman appeared to have targeted her near the store's cash registers. Officers can't say if the gunman and victim knew each other.
For now, no names are being released. The suspect is the man in the surveillance picture posted above.
No one else inside Walmart at the time of the shooting was hurt. Detectives are continuing to investigate and interview witnesses.
Meanwhile, people inside the store called the moments after the shooting chaos.
Witnesses recall hearing between four to six shots. One man told us people were screaming and running out of the store.
If you would like to follow Melissa Schroeder's reports on Facebook, you can click here and like her page.
Copyright 2016 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.