updated 1:42 AM EDT, Wed March 13, 2013
(CNN) -- Two days after he was pulled from the bottom of a swimming pool at a Disney resort in Florida, a 13-year-old boy from Missouri has died.
Anthony Johnson died Tuesday morning, according to the Orange County Sheriff's office. No cause of death was given.
"We are saddened by Anthony Johnson's passing and our hearts go out to his family, friends and loved ones," a statement from Disney said. "We have reached out to his family to offer care and assistance during this difficult time."
The boy was swimming at Disney's Pop Century Resort pool on Sunday evening with family members and other guests when he was spotted in about 4 feet of water by a cousin, who pulled him out, sheriff's deputies told CNN affiliate WKMG-TV. Lifeguards were not on duty at the time of the incident.
Buffalo, New York, firefighter William Cybulski said he gave CPR to the boy.
"You never want to see something like that especially when you're on vacation, or any child in general no matter where you are," he said in an interview with WKMG.
Cybulski's girlfriend, Crystal Loschiavo, told the affiliate she did her best to keep the family calm, including Johnson's brother.
"The little boy was really upset that it was his brother," Loschiavo said. "He kept saying 'this is my only brother, this is my only brother. I don't want anything to happen to him.'"
The Pop Century Resort is located in the ESPN Wide World of Sports complex in Lake Buena Vista, near Orlando.
It celebrates the "unforgettable fads of the 1950s through the 1990s," by saluting the "timeless fashions, catch phrases, toys and dances that captivated the world through the decades," the Disney website says.
CNN's Marylynn Ryan contributed to this report