All three victims suffered full cardiac arrest, apparently from breathing in smoke, according to Fire Department spokesman Larry Langford.
One of the men was in his 30s and the other was in his 40s, according to the Cook County medical examiner's office. The first man was pronounced dead at 9:54 a.m. at the University of Chicago Medical Center and the other was pronounced later at Jackson Park Hospital, officials said.
Their names were not being released pending notification of family, according to the medical examiner's office.
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