Celtic sit second in the Scottish Premiership, six points behind Hearts, amid a deepening crisis after Wilfried Nancy lost his fourth match in as many games when Dundee United beat Celtic 2-1.Daizen Maeda put Celtic ahead early but Krisztián Keresztes and Zac Sapsford struck in a three‑minute second‑half spell to overturn the game, with Kasper Schmeichel starting in goal and referee J Beaton officiating before 12,966 fans.Off the field, club president Peter Lawwell said he will step down at the end of the year citing an "intolerable" level of insults and threats, while chief executive Michael Nicholson said some staff had been assaulted after the recent cup final and defended the board's backing of Nancy.