Request For DOJ IG To Investigate Zapata Murder

Sharyl Attkisson of CBS News is reporting this afternoon that Rep. Darrell Issa (R-CA) and Sen. Chuck Grassley (R-IA) have sent a letter to Michael Horowitz, the Department of Justice Inspector General, requesting that he investigate the murder of Immigration and Customs Enforcement Agent Jaime Zapata. The murder weapons used in Zapata's death have been traced to guns that ATF allowed to be walked.

According to the letter, ATF may have had probable cause to arrest two firearms dealers before they bought and trafficked a weapon used to murder Zapata, who was on assignment in Mexico. "Only after Agent Zapata was murdered...and one of the weapons was traced back" to suspect Otilio Osorio "did ATF finally arrest Otilio, his brother and a third suspect for their gun trafficking activity," reads the letter.

Congressional investigators say ATF had earlier witnessed the Osorio brothers in a Walmart parking lot providing 40 weapons with obliterated serial numbers to be trafficked to Mexico. It was what's known as a "controlled delivery," meaning law enforcement officials were monitoring the sale. In this case it was part of a joint investigation with the Drug Enforcement Administration (DEA). But "ATF failed to confront the two individuals" leaving them to continue to allegedly traffic weapons, including one used in Zapata's killing, according to the letter.

The DOJ IG's office is said to be reviewing the request.