John "Jack" A. Kostelnik, Jr., 84, of Greensburg, died Friday, May 24, 2024, in his home. He was born April 20, 1940, in Greensburg, a son of the late John A. Kostelnik, Sr. and Mary Yurko Kostelnik. Jack was employed for over 40 years, as a retail merchandise buyer in Greensburg, Pittsburgh, New York, and Los Angeles; and purchased clothing lines for Troutman's, Hornes, Macy's, Allied Corporation, Kohl's, and Target. His career allowed him to travel to 40 different countries. As a U.S. Army Veteran, Jack served as an MP in Stuttgart, Germany, in the mid-1960s. He was Catholic by faith and attended the Blessed Sacrament Cathedral. In addition to his parents, he was preceded in death by his sister, Margaret Chesnick; brothers-in-law, Victor Rabbits, Edward Sloniger, Cornelius Nolan, and Barry Sloniger. He was also preceded in death by great-nephews, Jerry Fagert II and John Quinn; and great-niece, Kara Sloniger. His family includes six siblings, Canice Rabbits, Mary Elizabeth Sloniger, Bernadette Nolan, Helenita Skiavo (John), Andrea Sloniger, Robert Kostelnik (Annette); brother-in-law, Larry Chesnick. Jack is also survived by 12 nieces and nephews of whom he was very proud: Shelley Fagert and Vic Rabbits, Dave, Steve and Tom Skiavo, Mark Sloniger, Greg Sloniger and Julie Earl, Bryan Chesnick and Christy Katz, Leah Lamonte and John Kostelnik; he is also survived by great-nieces, great-nephews, cousins, an uncle and aunts. Relatives and friends are invited to celebrate the life of Jack, Thursday, in the CLEMENT L. PANTALONE FUNERAL HOME, INC., 409 W. Pittsburgh St., Greensburg, PA 15601, (724)-837-0020, from 4:30 p.m., until the time of services at 6:30 p.m. in the funeral home. Private inurnment will take place in Greensburg Catholic Cemetery Mausoleum. In lieu of flowers, memorial donations may be made to Temple of Faith Church, 1108 Jamison Ave., North Versailles, PA 15137. Jack's family has entrusted his care to the Pantalone Funeral Home Inc., Greensburg. For online condolences / directions, visit us at Natale N. Pantalone, supervisor To plant trees in memory, please visit the Sympathy Store.