In HISTORY’s new eight-part limited series “American Ripper,” the great-great-grandson of serial killer, H.H. Holmes, Jeff Mudgett, is determined to prove an astonishing, controversial theory: that H.H. Holmes and Britain’s notorious serial killer, Jack the Ripper, were the same man. Herman Mudgett, alias H.H. Holmes, was America’s first serial killer rumored to have claimed as …