The North Broward (FL) Hospital District's former internal-audit director claims in a lawsuit that he was fired after uncovering questionable payments to its former top executive. David Richstone sued the public-health system now known as Broward Health, alleging his termination two weeks ago was in retaliation for his refusal to end an investigation that found more than two dozen instances of "improper expenditures" to former CEO and President Alan Levine. Broward Health representatives said the system will "vigorously defend itself" against the suit.