Investigators said the fire Monday night was started by a person, but it was not clear if the fire was intentional or an accident.

Chicago Fire is a show where anything can happen to its characters. It's a firefighter drama where danger is always lurking for the heroes of Firehouse 51, sometimes even leading to death. Jimmy Borelli almost lost his life,

For the first time in five years, “Chicago Med,” “Chicago Fire” and “Chicago P.D.” are crossing over on Jan. 29. Here's how to watch the episodes and the order they're in.

The fire started shortly before 7 a.m. in a two-story apartment building in the 1300 block of West Fuller Street.

Drogos’ body was found inside his car, which was on fire in the driveway of the house next to the one in which he lived, Fox Lake Police Sgt. Rick Howell said Thursday. He said police and fire investigators are still piecing together what happened, but do not suspect foul play.

We have Chicago Fire to thank for One Chicago Wednesdays. The flagship series kicked off the NBC phenomenon in 2012. Over the last 13 seasons, we’ve come to think of the firefighters and paramedics of Firehouse 51 as family, watching them get married, have kids, and more.

The One Chicago night, as always, caps off with P.D. In “The Good Shepherd,” Intelligence makes a gruesome discovery that leads Torres ( Benjamin Levy Aguilar) to go undercover at the juvenile detention center where he served time as a teen. The promo shows that going awry.

NBC’s One Chicago is airing its first crossover in five years tonight. Here’s how to watch the epic event featuring "Chicago Fire," 'Chicago Med," and "Chicago P.D.."

How hard is it to create a three-episode crossover? Chicago Fire showrunner Andrea Martin dishes on that & more in this exclusive interview.

“This is not a crossover night. This is a three-hour film. This is a movie that happens to have all of your favorite One Chicago characters in it,” he dished to Us. “It is so large in scale, it is bigger than anything we’ve ever done. It is insanely impressive.”

The crossover starts at 8 p.m. with "Chicago Fire" followed by "Chicago Med" at 9 p.m. and "Chicago P.D." at 10 p.m.