A 4-year-old boy who had the “experience of a lifetime” meeting Vancouver police officers last month has died, his parents said Monday.Dominick “Nick” Matthew Zadak, who battled a pediatric liver cancer called hepatoblastoma since May 2015, died Thursday. His family, parents Katie and Robert Zadak and his sister, Anna, remembered Nick as a boy with a joyful smile, sweet demeanor and inspiring others with his positive attitude as he faced his cancer battle. Last month, Nick was visited by four Vancouver police officers, who let him ride in a patrol car, play with handcuffs and talk on the radio. In the months before his passing, Nick also went on a long list of adventures: He visited Disney World through the Make-A-Wish Foundation, played on the field at University of Washington’s Husky Stadium and had his very own Dozer Day with Catworks Construction. He also got to fly in a helicopter and ride in a boat in Florida, explore a fire truck in Portland and ride a school bus to his first day of kindergarten at Tukes Valley Elementary School.Nick’s family said they are heartbroken by Nick’s passing but are determined to keep his memory alive by living their lives inspired by his joy.