Arthur John Shawcross (June 6, 1945 – November 10, 2008), also known as The Genesee River Killer, was an American serial killer active in Rochester, New York from 1972 through 1989. Shawcross's first known murders took place in his hometown of Watertown, New York, where he killed a young boy and a girl. Under the terms of a plea bargain, he was allowed to plead guilty to one charge of manslaughter, for which he served 14 years of a 25-year sentence.