A man whose father died after waiting at least 30 minutes for a D.C. ambulance is pressing the District to address a series of delays in its ambulance service.

Durand Ford Jr.’s 71-year-old father went into cardiac arrest on New Year’s Eve, and D.C. did not have any units immediately available to help him. Ford said an ambulance from Prince George’s County came 30 to 40 minutes after the family’s 911 call.