A 68-year-old, ex-Marine was killed by the police in White Plains, New York in November of last year. His niece, who was present for the event, said she heard her uncle yell out, “Officers, officers, why do you have your guns out?” before being shot. Last month, the local county district attorney played recordings, taken from nearby camera — and other sources — for Kenneth Chamberlain Jr., the dead man’s son. Faced with conflicting accounts of how and why his father died, Chamberlain plans to sue.

The string of events that night sounds prosaic, a who-cares accumulation of little mistakes and misapprehensions. Cumulatively, though, it is like tumbling down the stairs. Somehow the uncle, Kenneth Chamberlain Sr., a former Marine who had heart problems and wheezed if he walked more than 40 feet, triggered his Life Alert pendant. The Life Alert operator came on the loudspeaker in his one-bedroom apartment, asking: “Mr. Chamberlain, are you O.K.?” All of this is recorded.

Mr. Chamberlain didn’t respond. So the operator signaled for an ambulance. Police patrol cars fell in behind — standard operating procedure in towns across America. Except an hour later, even as Mr. Chamberlain insisted he was in good health, the police had snapped the locks on the apartment door.

They fired electric charges from Tasers, and beanbags from shotguns. Then they said they saw Mr. Chamberlain grab a knife, and an officer fired his handgun.

Boom! Boom! Mr. Chamberlain’s niece Tonyia Greenhill, who lives upstairs, recalls the echoes ricocheting about the hall. She pushed out a back door and ran into the darkness beneath overarching oaks. He lay on the floor near his kitchen, two bullet holes in his chest, blood pooling thick, dying.

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