A city councilman in Alabama has been arrested and accused of killing his wife during an argument, authorities said.

Carbon Hill city councilman Robert Perry Warren, 51, was charged Monday with manslaughter in the death of 51-year-old Lisa Warren, news outlets reported.

Lisa Warren was last seen on Feb. 24 and Robert Warren reported her missing the next day.

Carbon Hill Police Chief Eric House said Robert Warren led authorities to his wife’s body. Police found her floating in a creek Saturday.

Court documents said the couple got into an argument on Feb. 25. During the fight, Robert Warren pushed Lisa Warren backward, which caused her to fall and hit her head, the documents said. She later died. An autopsy is pending.

The couple had been married for about 20 years. Robert Warren was appointed to the Carbon Hill City Council last year.

Additional charges could be added pending the ongoing investigation.