Lenny Oltmanns Obituary

We announce the death of Lenny Oltmanns of Monroe, South Dakota, who passed away on July 9, 2026, at the age of 66. Lenny will be remembered by family members, friends, and others whose lives were connected in meaningful ways. Family and friends are welcome to send flowers or leave their condolences on this memorial page and share them with the family.

He was loved and cherished by many people including: his parents, Emmo Oltmanns and Shirley Oltmanns (Potter); his wife Maureen Marquardt; his siblings, Dr. Matthew Oltmanns (Veronica) and Linda Vogel; his stepchildren, Laura Schultz (Jeff), Kevin Kostboth (Kirsten) and Paul (Heather Kostboth); and his nieces and nephews, Thalia Bracknell (Seth), Weston Oltmanns, Zack Vogel (Jessica), Danica Hanson (Matt), Serenity Vogel and Courtney Grieme (Jerod). He was also cherished by 8 grandchildren and 4 great grandchildren.