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The executive director of Louisville’s Metropolitan Sewer District will retire later this year, the agency announced Monday.

Greg Heitzman has been at MSD since December 2011, when he began serving as interim executive director after a state audit found numerous problems with the agency. For a year, Heitzman was simultaneously the head of both MSD and the Louisville Water Company, until he resigned from the water company to focus on MSD full-time.

In recent months, MSD was at the center of other controversies, including a labor dispute and questions about its process for selling surplus real estate.

Heitzman also spearheaded the Louisville One Water Partnership, exploring areas of redundancy and potential collaboration between MSD and the water company.

Mayor Greg Fischer said he has begun a nationwide search for Heitzman’s replacement.

Fischer on Monday also announced that Angela Akridge will be MSD’s chief engineer. She replaces current Chief Engineer Steve Emly, who will retire later this week.

Heitzman’s  base salary for 2015 is $256,859, according to data provided by MSD. Emly’s base salary is $137,588.