Due to lax policies on the part of the Department of Homeland Security, an illegal alien who had been convicted of drunk driving and had a series of other run-ins with police was not deported immediately. Instead, he was put into DHS' "Alternatives to Detention" program and in August 2010 he drove drunk and killed a nun and seriously injured two other nuns.

Read about it here, including the following from a report that the DHS appears to have tried to keep secret:

On May 7, 2009, after Montano served the portion of his sentence that had not been suspended, ICE took him into custody. Based on Montano's compliance during his prior participation in the ATD program, ICE officers released Montano on the prior order of supervision (dating back to 2008) with the condition that he report to ICE on a regular basis.

One excuse the DHS gives is that they had limited space in detention centers. Yet, John Morton thinks ICE has enough resources and wasn't demanding more funding.

Note also that this happened in Prince William County, home of the pro-illegal immigration, anti-white racists at 9500 Liberty whose documentary was promoted by Youtube corporate. Discrediting 9500 Liberty wouldn't have prevented this tragedy, but it might have increased the likelihood of stronger enforcement in that county. Unfortunately, few are willing and able to discredit those like 9500 Liberty, and some - like teaparty "patriot" Dan Riehl - actively try to block those whose coverage could be used to discredit far-left, anti-white, and pro-illegal immigration groups.