Bruce Arena resigns as New England Revolution coach amid MLS investigation into insensitive remarks

MLS placed Arena on leave and confirmed some allegations of inappropriate comments.
Assistant coach Richie Williams filed complaints that were part of the investigation.
Arena resigned after over a month on administrative leave during the investigation.
Arena is the winningest coach in MLS history with 5 MLS Cup titles.
Richie Williams named interim head coach; Curt Onalfo remains interim sporting director.