Wisconsin State Journal Editorial:

The public has a right to know if Ivan Mateo-Lozenzo, 21, attended West High School or any other Madison schools and for how long.
School district officials are stubbornly refusing to say.
Nor will they disclose if the district followed its own policies for screening new students when (or if) Mateo-Lozenzo enrolled at West using a fake name and age.
Police say Mateo-Lozenzo pulled the trigger in the shooting death of gang rival Antonio Perez, 19, on Madison’s East Side late last month.
Mateo-Lozenzo was an illegal immigrant from Mexico. But that’s not the central issue here because the U.S. Supreme Court has ruled that school districts can’t withhold public education because of immigration status.
The real issue here is school safety.