Seth A. Klausen, 33, of Rapid City, died Friday, December 8, 2017 at a hospital in Billings after a lengthy illness.

He was born in Milbank, SD to Kenneth and Kathleen (Hudson) Klausen on September 13, 1984. The family moved to Rapid City in 1985.

Seth graduated from Stevens High School in 2003. He graduated with honors from the South Dakota School of Mines and Technology with a degree in Computer Science in 2007. He enjoyed being a member of their robotics club as he loved using his brain.

He accepted a position as Systems Analyst with the Jefferson County School District in Lakewood, CO in 2007 where he developed applications for the school system.

In 2013, Seth took medical retirement due to complications from Friedreich's Ataxia, which eventually took his life.

Seth was a wonderful, courageous, honorable man who spent his life accomplishing everything that sparked his interest, including writing a piece of music with no formal musical background and reading a chemistry book "just for fun". He had a sharp wit that often had us rolling with laughter. He will be greatly missed by all who knew him.

He is survived by his father and step-mother Ken and Donna Klausen of Appleton, WI, his mother and step-father Kathy and Mark Stritar of Rapid City, his brothers Joel and Aaron of Rapid City, and numerous beloved aunts, uncles, cousins, nieces and nephews.

He was preceded in death by his maternal grandparents Kent and Alice Hudson, formerly of Edgemont, SD and Dickinson, ND and his paternal grandparents Earl and Irene Klausen of Rockville, NE.

Funeral services will be held at 11:00am, Friday, December 15, 2017 (casual dress) at Osheim & Schmidt Funeral Home with a visitation one hour prior to service time. Interment will be in Pine Lawn Memorial Park.