Justin Vu was on a family trip to Oregon when he first began showing symptoms. A Colorado father is speaking out after his 5-year-old son died after developing a rare disease during a summer vacation. Viet Vu of Denver, Colorado, said his son Justin fell sick suddenly while on a trip to Oregon with his mom, Terese Peden, and his siblings. Justin, 5, played T-ball and loved to meet new people, according to his father, Viet Vu. Justin with his family, including his parents, Terese Peden and Viet Vu.