Wrangel died suddenly on April 25, 1928, and Wrangel's family believed that he had been poisoned by his butler's brother, who lived in the Wrangel household in Brussels briefly and was allegedly a Soviet agent.
Wrangel døde pludseligt i 1928, og Wrangels familie mente, at han var blevet forgiftet af sin bror, som kortvarigt boede i hos ham i Bruxelles og angiveligt var sovjetisk agent.