Following the model that resulted in a 45 percent voter turnout, the City Clerk's Office has planned another mail-in special election to fill the vacancy left on the City Council by the death of Duke Bainum.

Bainum died Tuesday of an aneurysm.

Candidates seeking to fill his District 5 seat can begin filing paperwork Monday, said acting City Clerk Bernice K.N. Mau. The deadline for candidates to file is June 25.

Ballots to roughly 49,000 registered voters in the district will be mailed out soon after the voter registration deadline of July 8, and voters will have until Aug. 7 to return them.

Those who registered for the most recent election will be receiving ballots, Mau said, but she urged those who have moved since then to register again to ensure that the ballot reaches them, if they still live in the district.

Mau said the city also will hold walk-in absentee voting at Honolulu Hale, and officials also are searching for a site in the district where voters can go.

Cost estimates for the special election were not immediately available.

“;We're hoping it's not going to be more than what we did the last time,”; Mau said, referring to the special election held in April to fill the seat of Barbara Marshall, who died Feb. 22 of colon cancer.

The city spent about $250,000 to mail ballots to 56,000 voters in the Windward district, which includes parts of Kaneohe, Kailua and Waimanalo. J. Ikaika Anderson won the seat with 49 percent of the vote.

Bainum's district runs from Manoa Valley to the Ala Wai Canal and includes Manoa, Palolo, Moiliili and Kapahulu.

Based on Anderson's victory in the last special election, handicapping the race for Bainum's seat is difficult, said Neal Milner, a political scientist at the University of Hawaii-Manoa.

Anderson, a longtime aide to Marshall, had no prior experience in elected office compared with two of his main rivals, former Council members John Henry Felix and Steve Holmes. He also was outspent by Felix $187,000 to $36,000.

But Anderson had the backing of Marshall's widower and had some name recognition because he had campaigned for the state House seat in the district. He lost in the primary.