Walter Fredrick Morrison, the man credited with inventing the Frisbee, has died. He was 90. State Rep. Kay McIff, an attorney who once represented Morrison in a royalties case, says Morrison died at his home Tuesday. McIff is from Richfield, Morrison's original hometown. Morrison sold the production and manufacturing rights to his 'Pluto Platter' in 1957. The plastic flying disc was later renamed the 'Frisbee,' with sales surpassing 200 million discs. It is now a staple at beaches and college campuses across the country and spawned sports like Frisbee golf and the team sport Ultimate. Morrison co-wrote a book with Frisbee enthusiast and historian Phil Kennedy in 2001. Kennedy released a brief statement about Morrison on Thursday, wishing his late friend 'smoooooth flights.' 