It all hinges on what you mean by "worked with"
Let's assume that you work in one of the most dangerous cities - Baltimore and looking at the number of police killed by gunfire in the the last 20 years we get seven. The Baltimore police department is a bit over three thousand officers and a number of non-sworn employees. You didn't say they were friends, only that you worked with them. So, for example if you worked for the Baltimore PD, and you claimed that you worked with all 3000 then technically speaking you are correct.
However, if by "worked with" you mean on a day to day basis and that they were actually friends, then the numbers become tenuous. Looking at the typical number of friends from SNA (150) and saying that about 1/2 are from work, we get 75 or the odds that you actually knew any one that got killed are 75/3000 or .025. The odds of your being friends with two of them drop to .000625 or 1 in 1600 with three the odds drop to 0.000015625 or 1 in 64,000. You can see why I have a problem with what you said.
Your curiosity about me is kind, however it contributes no useful information to the thread. Bye for now, and I look forward to your contributions on further threads regarding police matters in which I might participate.
"Police chief dead, four officers wounded in Greenland shootout; suspected gunman found dead in home"
http://www.freerepublic.com/focus/f-news/2871567/posts
In this case, four officers can say they worked with an officer who killed by gunfire in the line of duty. And all the wounded officers can say that they worked with three officers who were wounded by gunfire in the line of duty.
I doubt that the city of Greenland is as big as Baltimore. Maybe things happen in smaller departments that mirror what happened in Greenland. Just sayin'.