Adams was shot to death last month at a McDonald's drive-thru on Chicago's West Side.
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Investigators said suspect Devontay Anderson, 21, may have traveled to Florida, but is also known to have connections in Indiana and Illinois.
He's been charged with first-degree murder in Adams' death. He was also charged with unlawful flight to avoid prosecution.
He's described as having black hair and brown eyes, weighing 150 to 160 pounds and being 5-foot-5 to 5-foot-6 inches tall. He also has a small tattoo of capital letters written in script over his right eyebrow.
Anyone with information is asked to contact his or her local FBI office or the nearest American Embassy or Consulate.