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A man accused of fatally shooting an Albuquerque man last year was an active DEA informant despite his criminal background, according to a lawsuit filed against the agency, the Associated Press reports.

The lawsuit claims the DEA did not properly supervise Jason Estrada, who was killed when he confronted a man accused of sexually assaulting a child.

The man, 31-year-old Edward Quintana, is charged with killing Estrada and criminal sexual penetration of a child under 13.