Cobo was mayor at the apex of the city's population of about 1.8 million in 1950. He died of a heart attack on September 12, 1957, just months before his last term in office would have ended.
Cobo was mayor at the peak of the city's population, approximately 1.8 million in 1950. He died from a heart attack on September 12, 1957, just before his final term in office would have concluded.