Authorities did not immediately identify the child who died at Schlitterbahn Waterpark in Kansas City, Kansas, but State Representative Scott Schwab and his wife released a statement saying it was their son Caleb Thomas Schwab.
"Since the day he was born, he brought abundant joy to our family and all those he came in contact with," said the statement, which asked for privacy as the family grieves.
Schlitterbahn spokeswoman Winter Prosapio said the child died on one of the park's main attractions, Verruckt, a 168-foot-tall water slide that has 264 stairs leading to the top.
Officials haven't provided specific details about what led to Caleb's death. Kansas City, Kansas, police spokesman Officer Cameron Morgan said he did not have any information, and Prosapio said more details would be released later.
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"We honestly don't know what's happened," she told reporters at a news conference. "That's why ... A full investigation is necessary. We have to understand what's happened."
Authorities initially said the victim was 12 years old, but Clint Sprague, a pastor who is acting as a spokesman for the family, said Caleb was 10.
Scott Schwab is a Republican from Olathe. He and his wife, Michele, have four sons, Sprague said.
House Speaker Ray Merrick told the Kansas City Star Schwab's family was "the center of his world."
Prosapio said the boy's family had been at the park with him on Sunday.
The 2014 opening of Verruckt was delayed a few times, though the operators did not explain why. Two media sneak preview days in 2014 were canceled because of problems with a conveyor system that hauls 100-pound rafts to the top of the slide.
In a news article linked to the news release announcing a 2014 delay, Schlitterbahn co-owner Jeff Henry told USA Today that he and senior designer John Schooley had based their calculations when designing the slide on roller coasters, but that didn't translate well to a water slide like Verruckt.