TOPEKA, Kan. — A water park co-owner accused of rushing the world’s tallest waterslide into service and a designer accused of shoddy planning were charged Tuesday in the decapitation of a 10-year-old boy on the ride in 2016. With the latest charges, three men connected with Texas-based Schlitterbahn Waterparks and Resorts and its park in Kansas City, Kansas, have been indicted by a Kansas grand jury, along with the park and the construction company that built the ride.