Chicago Police Department

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A search crew of the Chicago Police Department’s marine unit returns to the marine safety station Wednesday, Jan. 15, 2014, in Chicago after their search for a 21-year-old woman who fell into the icy Chicago River on Monday. A University of Minnesota student, Quoc-Viet Phan Hoang, survived after he and two others fell into the icy Chicago River. Twenty-six-year-old Ken Hoang, of St. Paul, Minn., was pronounced dead after he was pulled from the river Monday. Chicago police divers resumed their search for Hoang's other friend, a 21-year-old woman, Wednesday. (AP Photo/Kiichiro Sato)

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A search crew of the Chicago Police Department’s marine unit returns to the marine safety station Wednesday, Jan. 15, 2014, in Chicago after their search for a 21-year-old woman who fell into the icy Chicago River on Monday. A University of Minnesota student, Quoc-Viet Phan Hoang, survived after he and two others fell into the icy Chicago River. Twenty-six-year-old Ken Hoang, of St. Paul, Minn., was pronounced dead after he was pulled from the river Monday. Chicago police divers resumed their search for Hoang's other friend, a 21-year-old woman, Wednesday. (AP Photo/Kiichiro Sato)

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A search crew of the Chicago Police Department’s marine unit returns to the marine safety station Wednesday, Jan. 15, 2014, in Chicago after their search for a 21-year-old woman who fell into the icy Chicago River on Monday. A University of Minnesota student, Quoc-Viet Phan Hoang, survived after he and two others fell into the icy Chicago River. Twenty-six-year-old Ken Hoang, of St. Paul, Minn., was pronounced dead after he was pulled from the river Monday. Chicago police divers resumed their search for Hoang's other friend, a 21-year-old woman, Wednesday. (AP Photo/Kiichiro Sato)

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This image made from the YouTube website shows a still frame of the music video "Die L'z" by Bang Da Hitta posted on Aug. 8, 2013 with a man pointing a weapon at the camera. From the video, police in Chicago police identified two of those in the video as felons who are prohibited from being around guns. Both were later taken into custody. (AP Photo)

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Chicago police arrest a suspect on June 5, 2012. The Chicago Police Department narcotics division has been conducting undercover investigations in order to move in on suspected drug dealers in parts of Chicago's South and West sides. (AP Photo/Robert Ray)