Do you think that there would be a fair case for bringing Minnesota shooter / ICE agent Jonathan Ross under church discipline for 6th commandment violations?

It is reported that Mr. Ross is a "conservative Christian," so there's a 50% chance that he's a member of a church.

If someone were to try and press charges against Mr. Ross for murder, do you think that there would be a reasonable case to do so prior to a civil conviction, or does the church need to wait for the civil magistrate's conviction in all cases?

If he were to be judged guilty of murder / manslaughter in a civil court, would the church need to prove his guilt again, or could it take the civil sentence and move straight to discipline?

His is some kind of test case; I'm not convinced of the legitimacy of the shooting one way or another, but any way you look at it I think that the interaction between civil and ecclesiastical courts is interesting, and interestingly unexplored in Reformed theology.