. >> looking at the role h.h. holmes played in philadelphia's history and the questions that are still unanswered today. >>> also, a father's message. we'll tell you how a local man is using his own tragedy to spark a safety change. >>> and facing a deadline. we'll tell you what philadelphia d.a. seth williams may file for today in his corruption case. ostriches don't really stick their heads in the sand. a peanut is not a nut. and a real john deere is actually real affordable. you learn something new everyday. the surprisingly affordable john deere e series tractors. now you can own america's tractor for just $99 a month. learn more at your john deere dealer. [car engine failing to start] [wind blows] yo- wh- ah- he- [gas pouring] [slurps loudly] [engine starting] [loud slurping continues] >>> 5:15 now. it's part of our past that not many people know about or talk about. the nbc10 investigators uncovering new information about a notorious killer. >> reporter george spencer has a preview of a series of stories we're brin

we have been researching, traveling to h.h. holmesolmes experts. >> reporter: the streets of i'll city philadelphia hung with tourists are bright national monuments typically draw the biggest crowds. the attraction here is much darker. >>. >> the first topic on that tour is america's first serial killer, h.h. holmes. some experts say he killed as many as 200 people selling his victim's bones and commits insurance fraud. >> he was one of the worst that i've ever seen. >> reporter: he was a lifelong liar who some believe faked his own death. >> i think he convinced the public he was not such a bad guy. >> reporter: throughout the day the nbc 10 investigators explore his connection to philadelphia and pop culture, his crimes and the mystery surrounding his death that may soon be solved. >> he is here to talk about the investigation. there are so many pieces to this story. >> isn't it? >> there has been a renewed interest recently. >> this is one of the stories. it is one of the most fascinating stories i have worked on recently. it is on