JEFFERSON CITY, Mo. (AP) — Missouri’s Revenue Department Director Joel Walters is resigning following criticism over his agency’s handling of tax changes.

Gov. Mike Parson on Friday announced current department Chief Operating Officer Ken Zellers will take over as acting director when Walters steps down March 22.

Walters’ resignation comes after lawmakers repeatedly slammed him for not communicating better about tax changes that will mean some Missourians get smaller refunds or owe more when they file their taxes this year.

Walters did not specify why he’s leaving in his resignation letter to Parson.