In late 2014, following the fatal police shooting of Michael Brown in Ferguson, Mo., in which The Washington Post would track all on-duty fatal shootings by American police officers. The resulting project won the Pulitzer Prize and remains the definitive national dataset on police use of fatal force.
Some links:
Distraught People, Deadly Results
For 55 officers involved in fatal shootings this year, it wasn’t their first time
Fatal shootings by police remain relatively unchanged after two years