According to Granta - Violence in Blue,
One-third of all Americans killed by strangers are killed by police.
Is this true?
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To a reasonable approximation this appears to be true, although one quarter may be a more accurate figure
The total number of murders in the US for 2018 is 16,214, according to Statista, and this roughly agrees with data from other sources.
The US Department of Justice says that approximately 80% of murder victims know their killers, meaning that around 3242 people were killed by strangers.
Recent statistics for police killings are harder to come by, but various sources indicate a rate of around 1100 for the years 2015 and 2016, and no indication that this would have changed significantly in 2018. Statista gives 967 people shot to death by police in 2018, but excludes those killed in other ways (George Floyd would not be included).
Taking 1100 police killings and 3242 people murdered by strangers, then we can conclude that the number of people killed by the police is about one third of the number of people murdered by strangers.
There is a statistical wrinkle in that the people killed by the police were (virtually all) not considered murder, and so do not appear in the figures for murder. A better calculation would be to add the number of stranger murders to the number of police killings, giving us 4342, of which one quarter were killed by police.
Note that the figures of police killings includes those where the killing was justified.
this appears to be false as written. police only kill about 1k people per year, whereas car crashes kill somewhere around 30k people a year in the usa. 53% of car crashes involve more than 1 vehicle. if we assume that half of the car crashes victims in those are "strangers" to the driver who caused the crash. that would put the ratio around 8:1 without even counting other causes of death (e.g. crime). if we were to rephrase the claim as "one third of people who are shot to death by strangers are shot to death by the police", then that might be close to the truth.