State Rep. Terese Berceau, D-Madison, will not seek re-election this fall, according to a WisPolitics report.
Dane County Supervisor Shelia Stubbs announced on Friday that she will run for the seat.
Contacted by the Cap Times Friday, Berceau said she will issue a formal statement about the decision on Monday.
The 77th Assembly District covers much of Madison's west side. Berceau, 67, was first elected in 1998. She served on the Dane County Board of Supervisors from 1992 to 2000. She has run unopposed in most of her Assembly races.
Stubbs, 46, said in a statement that she has registered a campaign committee and will make a formal announcement in the "very near future."
"During her 26-year career on the Dane County Board and in the Legislature, Terese Berceau has been a dedicated public servant and a strong voice for women's health, consumer protection, workers' rights, the environment, health care reform and education," Stubbs said. "Together, we can build on her legacy and continue to fight for the values, issues and changes we need in these challenging times."
Stubbs was first elected to the county board in 2006. She is the board's only African-American supervisor.
Madison Ald. Sara Eskrich, who had been named as another potential candidate for the seat, said in an email she will not run.
"I'm excited to support Dane County Supervisor Shelia Stubbs for State Assembly District 77 and look forward to Madison electing a strong, representative woman of color to the state Legislature," Eskrich said.