Hero Firefighter

WALLING AVENUE FATALITY Oneonta Fireman Died Saving Kids, Sister-in-Law Says By LIBBY CUDMORE • Special to AllOTSEGO.com ONEONTA – John Heller, the former Oneonta firefighter who died when his home at 5 Walling Ave. caught fire Saturday morning, was trapped while helping his fiancee and his nephews escape the blaze, his sister-in-law reported. “What began as a fun sleepover with their uncle John and soon-to-be aunt Amber turned into a nightmare,” Erika Heller, his sister-in-law, wrote in a Facebook post…