May not be significant. Taxi cab drivers have a shockingly high rate of being murder victims. In terms of being a murder victim it's just about the highest risk profession in the US.
Your stats sound right to me.
http://www.nypost.com/news/regionalnews/17000.htm "COP DIES CHASING SUSPECT"
By PHILIP MESSING, TATIANA DELIGIANNAKIS and HASANI GITTENS
KEITH FERGUSON
"Apparent heart attack"
ARTICLE SNIPPET: "Ferguson, who lived in Fort Greene, Brooklyn, "has not taken a sick day in over 10 years," Kelly said.
"This is truly a tragedy one that we can't explain at this time," said Kelly.
The street vendor, Dembra-Yero Saoll, 43, has been charged with unlicensed general vending, resisting arrest and trademark counterfeiting."