Welcome to the Reader's morning briefing for Tuesday, April 19, 2016.

• Weather: Colder with rain possible

The heat wave breaks with a high of 58 and a low of 51. It will be cloudy and some rain is possible in the afternoon. [AccuWeather]

• Suspended Chicago police detective tied to Koschman case to return to work

Detective Nicholas Spanos will be allowed to return to work at the Chicago Police Department despite having been suspended for his role in the David Koschman investigation. Koschman died after being punched by Mayor Richard Daley's nephew Richard Vanecko in 2004. Vanecko wasn't indicted until 2012, after a Sun-Times investigation put the police under fire for mishandling the initial investigation. [Tribune]

• Karen Lewis: "100 percent" chance of teachers' strike as of now

Chicago Teachers Union president Karen Lewis spoke out about the union's decision to reject a third-party mediator's proposal, saying that Chicago Public Schools is not negotiating in good faith. District CEO Forrest Claypool says he hopes that CTU members will have a chance to review the report themselves and reach their own conclusion about the contract offer, which includes an average raise of 13.5 percent over the life of the proposed two-year contract. [ABC7 Chicago]

• NFL Draft street closures have already started

The NFL Draft Town is set to take over Grant Park again from April 28 through 30, and the street closures have already started. Anyone who lives near the park should expect traffic delays until the festival is over, according to the city. [Sun-Times Media Wire via ABC7 Chicago]

• Indoor skydiving comes to Chicago

Want to try skydiving but don't want to actually jump out of a plane? There's apparently a place you can do that. Lincoln Park's iFly allows thrill-seekers to free fall in an indoor flight chamber. The Tribune breaks down how it works. [Tribune]