Yes most unfortunate trajedy. The officer is, indeed, in my prayers.
The story suggests a speeder passed by. OK, even if that were true in reality, any individual whether in uniform or not my be aware of their surroundings especially when involved in re-entering a roadway or may any unexpected turns/u-turns.
It's been my belief that, more than "speed," driver inattentiveness is a far greater contributor to accident causation.
In fact there is some material online that has attempted an honest and thorough examination of this very subject.
May I suggest the following reads, please:
Which in turn references: