Actually, as I read this NJ report there were a couple of interlocking screw ups in this DSU murder case.
The police fixed on a suspect based on the fact that there was an argument a few hours prior to the shooting and stopped investigating.
The prosecutor’s office screw up (not telling the defense about a possibly exculpatory eye witness for 14 17 months) is worse and something that even the prosecutor’s office can’t get its head around.