The Hitchin primary school teacher, who has never been missing before, left home to calm down after a routine family disagreement, police said.

BBC: Family appeal to missing Bedford teacher

One witness told investigators that Mr. Davis was yelling and behaving erratically and that Mr. Han had tried to calm him down shortly before the violent encounter.

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One witness told investigators that Mr. Davis was yelling and behaving erratically and that Mr. Han had tried to calm him down shortly before the violent encounter at 12:30 p.m.

WSJ: New York Subway Push: Murder Charge for Suspect Naeem Davis