The only DNA found on a gun used to kill a prosecutor in Argentina belonged to the prosecutor himself, the lead investigator said Friday.
Alberto Nisman was found shot to death in his apartment on Jan. 18. His death came just hours before he was going to testify before congress about allegations that President Christina Fernandez protected Iranians accused of orchestrating a 1994 car bombing. The bombing happened at Jewish center in Buenos Aires.
Investigators tested the gun, but announced Friday that they only found trace amounts of Nisman's own DNA, Viviana Fein said, the Associated Press reported. Investigators also said Friday that a security camera in Nisman's building was not working at the time of the shooting.
The case has sparked controversy and an array of unanswered questions in Argentina.
Investigators looking into the death initially said "all signs point to suicide." That conclusion was met with skepticism, and the investigation came under scrutiny when it was revealed that Security Secretary Sergio Berni arrived at Nisman's apartment before police.
Then last week, President Fernandez called it "the suicide that (I am convinced) was no suicide." The government later said it suspected the death was the work of rogue agents from its own intelligence services.
Fernandez later called on congress to dissolve Argentina's intelligence service. In it's place, she planned to launch a new federal agency.