After the war, he regained his wealth. Kenner was fond of horses and owned one of the largest stock farms in the United States. In 1877 Kenner created the Louisiana Sugar Producer's Association, representing the largest planters in the state. He served as the president of the World Cotton Centennial. He also served on the Boards of Directors of several banks. Ten years later, a few months after his death, the Thibodaux Massacre was carried out by Democratic paramilitaries and concerned citizens in response to 10,000 sugar cane workers, 90% black, striking for three weeks, having been reverted almost to unpaid slave status. Kenner died on July 3, 1887. He was buried in a tomb in the Ascension of our Lord Catholic Church Cemetery in Donaldsonville, Ascension Parish, Louisiana.