A new lawsuit say a man charged with killing another man in Albuquerque was an active U.S. Drug Enforcement Administration informer who was improperly supervised.

The Albuquerque Journal reports the family of a Jason Estrada who was gunned down in 2013 near his South Valley home recently filed a $50 million lawsuit against the agency.

Thirty-one-year-old Edward Quintana has been charged with killing Estrada. He also is charged with criminal sexual penetration of a child under 13.

Albuquerque police say Estrada was killed when he confronted Quintana over the sexual assaults of a child.

The lawsuit claims Quintana previously was debriefed by agents and became a "confidential source" despite his criminal background.

A spokeswoman for U.S. Attorney's Office in Albuquerque said the office had no comment on the lawsuit.