Diane M. Horstmann's obituary , Passed away on March 18, 2026 in OFallon, Missouri
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Diane M. Horstmann

August 23, 1951 - March 18, 2026 (74 years old)

OFallon, Missouri

Diane M. Horstmann's obituary , Passed away on March 18, 2026 in OFallon, Missouri
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Newcomer Cremations, Funerals & Receptions, St. Louis

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Diane M. Horstmann

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August 23, 1951 - March 18, 2026 (74 years old)

OFallon, Missouri

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Diane M. Horstmann Obituary

The world bids farewell to Diane M. Horstmann (OFallon, Missouri), departing on March 18, 2026 at the age of 74. Diane leaves behind memories cherished by the community. You can send your sympathy in the guestbook provided and share it with the family.

She was predeceased by: her grandson Sebastian Horstmann; and her parents, Dorothy A. Aubuchon and Leonard H. Aubuchon. She is survived by: her husband Glenn Horstmann; her sons, Steve Horstmann (Theresa), Tim Horstmann (Heather) and Chris Horstmann (Rebecca); her grandchildren, Jacob Horstmann, Graham Horstmann, Kennedy Horstmann and Abigail Horstmann; and her brothers, Gary Aubuchon (Sandi), Bob Aubuchon (Vicki) and Dan Aubuchon (Karen).

Memorial contributions in Diane's name may be made to Assumption of the Blessed Virgin Mary Catholic Church.

Funeral arrangement under the care of
Newcomer Cremations, Funerals & Receptions, St. Louis

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March 25, 2026

Thomas Aubuchon lit a candle

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March 25, 2026

Thomas Aubuchon sent flowers

“In loving memory of Diane M. Horstmann, Wishing you peace to bring comfort, courage to face the days ahead and loving memories to forever hold in your hearts.”

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March 25, 2026

Frank Klostermann wrote a sympathy message

“Glenn, I am sorry to hear of the passing of your wife. Your uncle Pete told me of the sad news. As I understand Alzheimer's or something like that occured. My brother Paul Klostermann of Chesterfield, MO died of that a month or so ago. I wish the best to you. Looks like a big immediate family to support you. I still remember running around at your parent's house playing. Your dad was a favorite in-law cousin. I just finished successful cancer surgery. When in the Collinsville visit.”

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Events

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Fri

Mar 27

Visitation

Blessed Virgin Mary Catholic Church
403 N Main St, O'Fallon, MO 63366

Fri

Mar 27

Mass

Blessed Virgin Mary Catholic Church
403 N Main St, O'Fallon, MO 63366

Fri

Mar 27

Graveside service

Blessed Virgin Mary Catholic Church
403 N Main St, O'Fallon, MO 63366

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