Hello. I thought maybe Jean was using a site I just discovered, but the crime story wasn't first; rather, an obit for Joseph, who looks like he is Frank's father, and then one for Anna. Nothing really helpful in either of these.
Go to http://fultonhistory.com
and enter krulish and you will get quite a list. Note: reading some of this stuff is definitely not for children.
According to the Margie Sobotka book, page 76, the Nebraska Dusatko folks came from Krchleby near Caslav, as Jean said. Records for the 1857 time frame are not yet online at actapublica.eu (Praha archives) but some earlier ones are, and you might find Dusatkos in the 1733 to 1819 timeframe. However, that book is not indexed and it's 339 pages long. That would be difficult, unless the Krchleby records are in a section by themselves. There's a 32 page marriage book that would be easier to read, but it goes to 1840.