i think. he s filling a void for me. it s special. reporter: when dave recently spent his last day on the job before retiring, he wanted to make it special for caleb too making him an honorary u.p.s. driver for the day. want to go around and get in the truck and sit in the driver seat. caleb climbed into the driver seat. let s do it. reporter: and sounded the horn. then dave and caleb had one last package to drop off. this is from your honorary u.p.s. driver of the day. reporter: to nicole, caleb s do i get a hug? a hug. oh, thank you. reporter: a final delivery both will never forget. i love seeing him here. he s a great kid, and we need to give these kids everything we have. quite a bond. thanks for watching. have a great night.
finally tonight, america strong. the u.p.s. worker and the special delivery. u.p.s. driver dave weingardt has delivered packages to thousands of homes in colorado for more than 30 years. and i ve been driving down here for a long time. reporter: but there is one young man he developed a special bond with, 16-year-old u.p.s. fan caleb lambert. caleb came into my life at that point for a special reason. he was born with a congenital brain defect. it causes his intellectual disabilities as well as severe seizures. reporter: dave immediately bonding with caleb when he realized he shared a similar condition to his own teenaged son. kaymen was 17 last year at the end of march when he passed. he had a seizure. reporter: despite his heartache dave keeping that connection with caleb. he feels like he is my son. that s why he came into my life,