The Chicago teenager was dumped in Dolton, Ill., on Christmas Eve.
Casara was pronounced dead at a hospital, but doctors were able to save her 1-pound, 5-ounce baby girl. Her daughter, Lailani, is fighting for her life at a hospital.
Police say Casara's death was related to a robbery involving drugs.
Another suspect is expected to be arrested in the 17-year old's murder. More
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