Joseph Kunkel Jr., beloved in south city for the pretzels he sold at the corner of Jamieson and Fyler, has died at the age of 94.A retired U.S. postal clerk, Kunkel was a presence on the corner since 1980, selling pretzels to passing motorists and pedestrians alike. His son told KTVI (Fox-2) that he started with treats from south city's Giegerich Pretzel Co., which closed in 1999.…