Former state Sen. Matt Matsunaga was among three people filing candidacy papers for the City Council's 5th District seat yesterday, completing the field of 14 candidates for the Manoa-Kapahulu seat by the 4:30 p.m. filing deadline.

Matsunaga, 50, served in the state Senate from 1992 to 2002 representing an area that includes much of the 5th District. The son of the late U.S. Sen. Spark Matsunaga, the Mo'ili'ili resident is a practicing business attorney.

The 5th District seat was left vacant when Duke Bainum died June 9 from complications of an aortic aneurysm.

The mail-in special election to take place in the coming weeks will be to fill the remaining 3 1/2 years of the term.

Matsunaga joins former City Councilwoman Ann Kobayashi as the two candidates in the field with elected office experience.

A Manoa resident and also a former state senator, the 72-year-old Kobayashi held the seat from 2003 to 2008, when she decided against running for re-election and took on an unsuccessful bid to unseat Mayor Mufi Hannemann.

Two other candidates are the offspring of community leaders.

Palolo resident Heidi Bornhorst, 51, is a horticulturist and the daughter of Marilyn Bornhorst, who served on the City Council from 1975 to 1988 and whose district included much of what is now the 5th District before boundaries were changed.

Kapi'olani resident Nathaniel Kinney, 29, is legal counsel for the International Union of Painters and Allied Trades District Council 50. His father, Lynn Kinney, heads that union.

Kapahulu resident George Waialeale, 61, also has union ties. He was former manager for the International Brotherhood of Electrical Workers.

Other candidates: