If the prosecutor thinks they can get a criminal conviction for murder (or whatever) that is a totally separate process that is between the People (whom the prosecutor represents) and the defendant (in this case, the LEO who killed the guy in the line of duty). Qualified Immunity never applied to criminal cases(1). But criminal cases will not provide any money or anything like that to the victim (or their family)- that comes from civil suits alleging that the LEO violated someone's civil rights. And that is what removing Qualified Immunity encourages, individuals who were harmed can sue individual officers and receive payments from those individual officers (Colorado's police reform bill holds individual officers responsible with their own money up to certain limits where the organization becomes responsible; I don't know about other states).
1: Which are rare against LEO's because prosecutor's don't want to anger the LEO's that they work with regularly. This is why civil suits are generally the main avenue for people to get justice from over-zealous LEO's.
The Fifth Amendment of the US Constitution says, in its entirety:
"No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of War or public danger; nor shall any person be subject for the same offence to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation."
The key in this context is "No person shall ... be deprived of life, liberty or property, without due process of law." If a government agent takes that from you without due process that is a civil right of yours being abridged, at least in the US. I can't speak for other countries.
