[Drew68]

And the overwhelming majority are killed in automobile accidents or other types of accidents.

I was curious about this statistic and immediately wondered out of all the cops killed on duty, how many are actually murdered?

I suspect very few.

[WayneS]

I was apparently not correct in my original assertion. It appears that about half the officers killed in the line of duty are murdered (Assault, gunfire, assault by vehicle):

Here are the stats for 2014, so far:

Line of Duty Deaths: 64

Assault: 1
Automobile accident: 15
Fire: 1
Gunfire: 27
Gunfire (Accidental): 1
Heart attack: 6
Motorcycle accident: 2
Struck by vehicle: 3
Vehicle pursuit: 2
Vehicular assault: 6

Read more: http://www.odmp.org

Of course, they don’t say how many of the officers killed by gunfire are actually shot by a perpetrator, while on duty. I suspect they bury suicides in there somewhere.