Gary Lee Kosterman

Gary Lee Kosterman, a resident of Oak Creek, WI, formerly of Kennan, WI, passed away peacefully surrounded by family January 13, 2026. He was born January 16, 1952, in Kennan, WI, to parents Edward and Florence Kosterman.

Dear father of Jeremy (Mary), Jason (Starr), and Adam (Brittany). Proud grandfather of Taylor, Anna, Ryder, Hunter and Cassius. Loving brother of Linda Heizler, Deb (Don) Ringersma, Art (Sue) Kosterman and Connie (Dan) DeLasky.

He was preceded in death by his parents, sister Bonnie, brother Daniel, brother-in-law Kenny and wife Kathleen.

After graduating from Phillips High School, Gary joined the Army Reserves and was honorably discharged before he dedicated over 40 years of his life to the manufacturing industry, working with pride and skill at companies such as Harley-Davidson, General Automotive and Golner Precision.

He enjoyed spending time outdoors hunting, fishing and golfing, and cherished time with his family, especially cheering on his children and grandchildren at their sporting events.

A Celebration of Life will be held Saturday, February 7, 2026 from 11:00am -3:00pm at Trailside Bar & Grill located at N8105 State Hwy 13 in Phillips, WI.

In Lieu of flowers, memorials to the Alzheimer’s Foundation of America at alzfdn.org