Another Sanctuary City horror story from San Francisco... Rony Aguilera had been previously arrested for a violent assault in 2007, but was not turned over to federal immigration authorities because of the city's policy of protecting dangerous foreign criminals. authorities have charged him with stabbing a 14-year-old boy to death last July.

A teenager accused of stabbing a 14-year-old boy to death in a gang-motivated attack had been given sanctuary from deportation under San Francisco's previous practice of shielding young illegal immigrant felons from federal authorities, records show.

Rony Aguilera, 17, known as "Guerrillero," has been charged as an adult in the July 31 sword attack in the Excelsior neighborhood that killed Ivan Miranda, who police say was an innocent victim caught up in an act of gang vengeance. Authorities believe Aguilera is an illegal immigrant from Honduras, but he was never referred to federal officials after being arrested last year in an assault case, according to records reviewed by The Chronicle.

Aguilera is the second person this year to be charged with murder in San Francisco after having been protected from possible deportation, under city officials' now-discarded interpretation of a sanctuary ordinance that bars agencies from cooperating with federal efforts to round up illegal immigrants.

In June, Edwin Ramos, now 22, an alleged illegal immigrant from El Salvador who compiled a record of gang-related crimes as a juvenile, was accused of fatally shooting Anthony Bologna, 48, and his sons Michael, 20, and Matthew, 16, in their car in the Excelsior. [Suspect in boy's slaying avoided deportation, by Jaxon Van Derbeken, San Francisco Chronicle, November 14, 2008]