An Arby's manager in Oklahoma was arrested for allegedly shooting and killing a customer after an altercation where the customer spit in her face, police say.

The Tulsa Police Department said officers responded to a crash at a local Walmart on March 23 and discovered the driver, 25-year-old Desean Tallent, had been shot in the upper torso.

After further investigation, Tulsa police said Tallent had been involved in an altercation with a manager at an Arby's ending with him "making threats to the manager and spitting in her face."

Tallent returned to the Arby's an hour later and circled the parking lot, while the manager, 25-year-old Deionna Young, ran outside and got into her car, police say. She later shot at Tallent — who later died from his injury — and went back to work, police said.

Tulsa police said Young confessed, and has been booked for first degree murder.

In a statement to ABC affiliate KTUL, Arby's said it is conducting a "comprehensive internal investigation into the incident."

The Associated Press contributed to this report. Follow Brett Molina on Twitter: @brettmolina23.