Originally Posted by indesertum
Wouldn't they have to had passed a verdict saying not guilty?
My knowledge of our justice system is very limited
Oh, I see. Just a bit of semantic confusion.
The jury that decides a case at trial is actually called a "petit jury" under old legal jargon. A "grand jury" is a bit different -- their role is usually limited to pre-trial proceedings (such as deciding whether or not the government has amassed enough evidence to file a case against the defendant).
From a very quick glance at an article, it looks like the kid was convicted at trial (generally a decision made by a jury, unless the defendant agrees to waive his right to a jury) but given relatively lenient sentence by the judge. With some limited exceptions, sentencing decisions are usually made by the judge, not the jury.