IN MEMORIAM: Operating Engineers Local 513’s Jonathan Castloo


Union collecting donations for family

Jonathan Castloo, an eight-year member of Operating Engineers Local 513, passed away March 12, 2021 after a tragic accident. He was 35.

Brother Castloo, of Lake Saint Louis, received his mechanical engineering associate’s degree from St. Louis Community College and graduated with honors. He then moved on in his career as a part of Local 513 and obtained his Mariner’s License through the U.S. Coast Guard.

“Local 513 would like to express our sympathy and offer condolences to our brother member Jonathan’s family and friends,” said Local 513 Business Manager Tim Sappington. “We will be accepting donations on behalf of the family at all of our April union meetings.”

Brother Castloo was loved by many and was always there to lend a helping hand. He was passionate and dedicated in everything he did. For someone who considered himself to be an introvert, he could talk your ear off and get along with anyone. He worked hard to provide a home for his family and always had his “gears turning” to make for a better tomorrow. His recent motto in life was, “Have a great day on purpose.”

He is survived by his wife, Amanda Castloo; his children, Griffen Stephen Castloo, Hudson Stephen Castloo, and Melanie Nichole Seaman-Denson; his parents, Charles Castloo and Teresa Morris; his brother, Christopher Castloo, his nephew, Corben Castloo; and a host of other family members and friends.

A funeral service was held March 26 at Immaculate Conception Catholic Church in Dardenne Prairie, followed by a celebration of life ceremony at Mattingly’s in Lake Saint Louis.

In addition to Local 513 collecting donations on behalf of Brother Castloo’s family, a GoFundMe account has been set up at


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