State Representative Tim Moore, a champion of pro-life issues and a voice for veterans, resigned his legislative seat.
Voters will have an opportunity to fill the unexpired portion of his current term in November.
Moore, a Republican from Elizabethtown, announced his decision by citing his opposition to a system that embraces career politicians.
Moore also said increased responsibility in his Christian ministry work have expanded and he has chosen to resign effective immediately.
Moore represents the 18th House District, which covers all of Grayson County and a sliver of Hardin County. He began his service in the House in 2007 from a district which then included much of the northern half of Hardin County.
Local party leaders from Grayson and Hardin counties must submit a nominee for the special election by 4 p.m. Tuesday. County Clerk Debbie Donnelly said write-in candidates interested in the race have until 4 p.m. October 8 to express interest.
All House seats are two-year terms. The race again will appear on the primary and general election ballots in 2020.
The 18th District encompasses Grayson County and the Hardin County precincts of Tunnel Hill, Stephensburg, Howevalley, Meeting Creek, Oaklawn, Pine Valley plus Rineyville West, Rineyville South and Rineyville North.