Chicago has lost two firefighters in two days after a severe blaze at a high-rise building on DuSable Lake Shore Drive killed Lieutenant Jan Tchoryk. A "mayday" alert was activated when the 55-year-old firefighter "went down" as he worked at the fire scene, with the cause of his death yet to be determined by medics. A "tragic week" had seen Jermaine Pelt die at another blaze the previous day. Tchoryk was leading a crew to the 27th floor, which lacked sprinklers, when he collapsed. Three firefighters and two civilians were also injured in the blaze, which was confined to one large apartment. The building had been reported to city officials last year for obstructing a firehose connection with its plants. The tragedy marked a sad end in the 25-year firefighting career of Tchoryk, a Navy veteran and father of a rookie Chicago police officer.