The suspect in an upstate New York multiple murder is named Frank Garcia. He's apparently from Hilton, NY, a typical American small town which is demographically only 1.49% Hispanic. He's probably American-born, a guess I'm making based on his first name. Ontario County, where the shooting occurred, is also demographically behind the times, so much so that they don't have any murders:

A rare charge in Ontario County
By Jessica Pierce
Canandaigua Daily Messenger
Posted Feb 16, 2009
Canandaigua, N.Y.   

Frank Garcia could be the first person in at least 30 years to be charged with first-degree murder in Ontario County.

That’s according to Ontario County District Attorney R. Michael Tantillo, who intends to ask a grand jury to consider the charge within the next two weeks.

If the charge is levied, however, Garcia won’t be considered a  “capital” case and won’t face the possibility of the death penalty because the Court of Appeals has struck down that statute, ruling it unconstitutional, in a 2004 case called People v. LaValle. The death penalty had returned to New York state nine years earlier.[More]

Does the fact that suspect Garcia was probably born in the United States mean that we   shouldn't put in the "Immigrant Mass Murder" category? Not really.