Mark Grau

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Mark Allen Grau, 64, of Freeburg, IL, born August 22, 1958, in Belleville, IL, died Monday, May 22, 2023, in Albuquerque, New Mexico.

Mr. Grau was a systems engineer at Prometheus Security Group Global. He was a United States Marine Corps veteran and a United States Army veteran. Mark was a member of St. Joseph Catholic Church, Freeburg, IL. He loved golf, hunting, and all sports. The Chili Cookoff was one of his favorite events. Mark was a loving and supportive father, brother, grandpa, and uncle. He was the kind of man/father you could always count on.

He was preceded in death by his parents, Walter and Golda, nee Harris Grau.

He is survived by three sons, Jason (Amie) Grau, Jake (Brettney) Grau, and Joseph (Brooke) Grau; a daughter, Clair Wiechert; eight grandchildren, Jasmine, Briley, Kenleigh, Kaislee, Greyson, Emma, Mikey, and Maverick; two sisters, Joyce A. Weber of St. Louis, MO,  and Debbie S. (Dale) Wilson of Belleville, IL; three brothers, Allen L. (Debbie) Grau of Haubstadt, IN, Jack J. Grau of Lenzburg, IL, and Jim W. (Cindy) Grau of Fayetteville, IL; and many nieces and nephews.

Memorials may be made to the Wounded Warrior Project. Condolences may be expressed to the family online at

Visitation:  Friends may visit from 4 to 8 p.m. Thursday, June 1, 2023, and from 9 to 10 a.m. Friday, June 2, 2023, at St. Joseph Catholic Church, Freeburg, IL.

Funeral: A Mass of Christian Burial will be held at 10 a.m. Friday, June 2, 2023, at St. Joseph Catholic Church, Freeburg, IL, with Fr. Von Deeke and Deacon Corby Valentine officiating.

Burial with military honors will be at St. Joseph Catholic Cemetery, Freeburg, IL.


12 Comments on Mark Grau

Mandy Huffman said : Guest Report Jun 01, 2023 at 9:09 PM

He sure is gonna be missed by a lot of people I’ll always remember him calling me the nickname he gave me…You all have my condolences for your loss….prayers

  • Freeburg
  • IL
Thomas Carney said : Guest Report May 30, 2023 at 10:53 AM

My sincere condolences. Mark was a good friend and I am so sorry to hear of his passing, my thoughts and prayers are with all of you. His humor and support will be greatly missed by everyone.

  • New Carlisle
  • Ohio
Sam Pruett said : Guest Report May 30, 2023 at 8:59 AM

I’ve had the pleasure of working with Mark for the better part of 3 years. I was able to build a great friendship with him over that time and spend some laughs together. Rest easy Devil Dog, I’ll have the watch from here.

  • Somerset
  • Ky
Tara McDonald said : Guest Report May 29, 2023 at 5:40 PM

One of the Most decent kind and fun loving person that I had been so thankful and blessed to have known in my life. You will be very missed.

  • Freeburg Illinois
  • Illinois
Sue Edgar-Koch said : Guest Report May 28, 2023 at 9:29 AM

Joey, Jake and Jason, Gene and I were so very sorry to hear of your dad’s passing. All of you and your families will be in our good thoughts and silent prayers.

  • Evansville
  • IN
Tom Hill said : Guest Report May 27, 2023 at 10:14 AM

Sorry for your loss

  • Freeburg
  • Il
Jay and LINDA Krieg said : Guest Report May 26, 2023 at 8:28 PM

Our neighbor and friend who was compassionate and big hearted, honest and humerous. A friend and confidant with truth and would do anything for almost anybody. My friend - you will be missed, with love and admiration….

  • Freeburg
  • IL
Kathy Ernst Winterbauer said : Guest Report May 26, 2023 at 12:19 PM

So sorry to hear of the loss of my cousin Mark. He was such a nice person. Always enjoyed talking with him. Our Deepest Sympathy to all of the family.

  • West Mifflin
  • PA
ray scott said : Guest Report May 26, 2023 at 10:40 AM

I am deeply saddened by the passing of my long time friend and colleague. We traveled a lot together for work and talked on the phone almost every day. I will miss him and his genuine outgoing personality and his wonderful sense of humor. Rest peacefully my friend. We love and miss you.

  • Peoria
  • Arizona
Connie Jean Goyda said : Guest Report May 26, 2023 at 5:42 AM

Family of Mark Grau: you all have my deepest sympathy on your loss. I remember Mark from years ago and your grandparents, too. He was and is a wonderful person.

  • Belleville
  • IL
Slick said : Guest Report May 26, 2023 at 3:47 AM

I was shocked to hear about my good friends passing. He was always a true friend when he supported me in a very hard time in my life we had a great day when we won first place in the chili cook off I got to meet most of his large family and enjoyed spending time with all of them I will sadly miss our talks about family and sports. RIP brother

  • Swansea
  • IL
Diana Borger-Savoia said : Guest Report May 25, 2023 at 7:53 PM

To the Grau family, I'm so sorry to hear of the loss of your brother Mark, Sending my sympathies..Randy Koesterer was my brother, and my Mom and Goldie were friends for years...sending love and prayers to all... Respectfully Diana "Koesterer" Borger-Savoia..

  • Belleville
  • IL

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