ARLINGTON, Texas - The city of Arlington says a little boy became sick and died likely from something in the water at a city park splash pad.The city admits that the splash pad and others were not properly maintained.Arlington officials say the boy was infected with a rare, brain-eating amoeba, which was detected at the splash pad after the boy became sick and passed away.The city also discovered that and other splash pads in Arlington were not properly maintained to prevent water from becoming contaminated.Tarrant County and the city of Arlington received a notice the child was in the hospital in early September and launched an investigation that revealed there were multiple gaps in the city's water testing process.