Jeffrey S. Martens, 61 of Sioux City passed away Friday, October 30, 2026. A Funeral Mass will be 10:30 A.M. Monday, November 9, 2026 at Immaculate Conception Catholic Church. Visitation will be Sunday, November 8, 2026 from 3 to 5 P.M. with 5 P.M. vigil service at Meyer Brothers Morningside Chapel. Burial will be at Calvary Cemetery. In lieu of flowers, memorial donations may be directed to Hospice of the Midwest or Mater Dei Parish.