Saturday night two Chicago police officers were shot and one was killed during a traffic stop on the south side of the city. Federal investigators have determined that the gun used was purchased in Hammond, Indiana.

Jamel Danzy, of Hammond, was arrested Monday and remains in federal custody following his first court appearance Monday afternoon.

Danzy, 29, is charged with conspiracy to violate federal firearm laws, including knowingly transferring and giving a firearm to an out-of-state resident, knowingly making a false written statement to acquire a firearm, and knowingly disposing of a firearm to a convicted felon.

investigators determined that he bought the gun that was used to kill Officer Ella French, on March 18 in Hammond.

“Straw purchasers and firearm traffickers enable violence with deadly consequences,” said John R. Lausch, Jr., United States Attorney for the Northern District of Illinois. “Fighting violent crime is a top priority in our office, and we are committed to holding accountable those who engage in illicit firearm transactions.”