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Thomas Sierra, center, exits the George N. Leighton Criminal Courthouse on Tuesday. (Matt Masterson / Chicago Tonight)

Thomas Sierra, 41, spent more than half his life in prison, convicted of a murder he has claimed from the beginning he didn’t commit. On Tuesday, the Cook County State’s Attorney’s Office dropped the charges. “It’s a bittersweet situation,” Sierra said.

(Courtesy Shedd Aquarium)

If scuba diving with whale sharks or kayaking past glaciers sounds like you’re kind of thing, Shedd Aquarium has a trip for you this year.

State regulators are set to approve a pipe modernization project that could double your natural gas bill over the next 20 years.

(Chuck Grimmett / Flickr)

Will the attorney general’s reversal of an Obama-era policy give prosecutors free rein to aggressively enforce pot prohibition?

(Centers for Disease Control and Prevention)

They are the oldest forms of life on Earth and without them humans would not exist. How microbes shape the planet and its people.

Virginio Ferrari (Chicago Tonight)

Born in Italy, Virginio Ferrari came to Chicago in the 1960s, and he blossomed into an internationally sought-after sculptor. We visit the 80-year-old in his Bridgeport studio.

A scorching accusation by a candidate for Illinois governor adds fuel to the gentrification debate in Chicago.

President Donald Trump surprised both supporters and detractors when he seemed to endorse an immigration deal a day after the White House announced that nearly 200,000 Salvadorans who have been in the country for more than a decade must leave.

Watch the Jan. 9, 2018 full episode of "Chicago Tonight."

Illinois Public Health Director Dr. Nirav Shah appears on “Chicago Tonight” on Jan. 4, 2018 to discuss the state’s opioid epidemic.

Illinois Public Health Director Nirav Shah told lawmakers Tuesday that he’s “proud” of the government’s response to an outbreak of Legionnaires’ disease at a state veterans home in Quincy. But critics say it was a delayed reaction that put veterans at risk.