Leonardo DiCaprio has signed on to portray one of the first-ever documented serial killers in American history. The movie will be based on the best-selling non-fiction book “The Devil in the White City” by Erik Larson. DiCaprio will play Dr. Henry Howard Holmes, who confessed to 27 murders, but he’s believed to have committed up to 200 during the time the city of Chicago was hosting the 1893 World’s Fair. Holmes opened a three-story hotel that took up a whole street block, where many of his murders took place. The hotel had a gas chamber, crematorium and a dissecting table where Holmes would murder his victims, who were mostly his female employees, his lovers and hotel guests. DiCaprio will not only be starring in the flick, but his company secured the screen rights to the book and will produce the movie.