>> found him, he's lying there and i couldn't feel a pulse. >> the young dad, engaged to be married, dead on the ground. >> they determined that it was a murder. >> and here is what made this mystery so chilling. the possible suspects were all in costume. >> the cattle boy and the penguin, everybody is dressed as somebody else. how are you going to be able to identify people in? >> cowboy? penguin? costumed killer? sounds like something ripped from the pages of stephen king. but in this case the horror was real. >> we had this piece of a costume. we didn't know what it was. >> a halloween crime that will send shivers down your spine. >> i was terrified. something had happened. i didn't know what. hello and welcome to