Kim Trew, a veteran NDP member of the Saskatchewan legislature, says he won't run in the next provincial election, slated for 2011.
Trew currently represents the Regina Coronation Park constituency.
He was first elected in 1986.
"It has been both an honour and privilege to serve the people of this constituency and the New Democratic Party for the past 24 years," Trew is quoted as saying in a news release issued Friday. "I don't mind saying that these years have been some of the best years of my life."
He said he was leaving to allow new people a chance.
"It is time for renewal in my constituency organization and my party," he said.
Trew added enthusiastic support for the party's new leader, Dwain Lingenfelter.
In his time at the legislature Trew had a brief stint as a cabinet minister when the NDP was in government. Notably, Trew was the minister of Labour for a few months in 2001.