 Connie Weber, Arizona News Radio. Mojave County officials confirmed that a baby died over the weekend there due to the heat. Mojave County Sheriff's spokeswoman Anita Mortensen says a family called for help when their four-month-old girl was unresponsive as they were on a boat on Lake Havasu and responders took her to Lake Havasu Regional Medical Center. The child was later transported to Phoenix Children's Hospital but succumbed to their injuries and passed away.