Border Patrol agent on trial in killing of teen rock-thrower

In this Dec. 4, 2017 photo, a slogan asking for justice for 16-year-old Mexican youth Jose Antonio Elena Rodriguez, who was shot and killed on a street in Nogales, Sonora, Mexico, is displayed on the streets' border wall where he was killed. A U.S. border patrol agent is going on trial for second-degree murder in U.S. District Court in Tucson on Tuesday, March 20, 2018, in a rare Justice Department prosecution of a fatal cross-border Mexico shooting. Lonnie Swartz is charged with firing multiple shots from the Arizona side of the border into Nogales, Mexico more than five years ago and killing Rodriguez. (AP Photo/Anita Snow)
FILE - This April 2, 2017 file drone photo shows the U.S.-Mexico border fence on the outskirts of Nogales in southern Arizona. A U.S. border patrol agent is going on trial for second-degree murder in U.S. District Court in Tucson on Tuesday, March 20, 2018, in a rare Justice Department prosecution of a fatal cross-border Mexico shooting. (AP Photo/Brian Skoloff, File)
In this Dec. 4, 2017 photo, a portrait of 16-year-old Mexican youth Jose Antonio Elena Rodriguez, who was shot and killed in Nogales, Sonora, Mexico, is displayed on the street where he was killed that runs parallel with the U.S. border. A U.S. border patrol agent is going on trial for second-degree murder in U.S. District Court in Tucson on Tuesday, March 20, 2018, in a rare Justice Department prosecution of a fatal cross-border Mexico shooting. Lonnie Swartz is charged with firing multiple shots from the Arizona side of the border into Nogales, Mexico more than five years ago and killing Rodriguez. (AP Photo/Anita Snow)
FILE - This April 2, 2017 file photo made with a drone, shows the U.S. Mexico border fence as it cuts through the two downtowns of Nogales, Ariz. A U.S. border patrol agent is going on trial for second-degree murder in U.S. District Court in Tucson on Tuesday, March 20, 2018, in a rare Justice Department prosecution of a fatal cross-border Mexico shooting. (AP Photo/Brian Skoloff, File)

Border Patrol agent on trial in killing of teen rock-thrower

In this Dec. 4, 2017 photo, a slogan asking for justice for 16-year-old Mexican youth Jose Antonio Elena Rodriguez, who was shot and killed on a street in Nogales, Sonora, Mexico, is displayed on the streets' border wall where he was killed. A U.S. border patrol agent is going on trial for second-degree murder in U.S. District Court in Tucson on Tuesday, March 20, 2018, in a rare Justice Department prosecution of a fatal cross-border Mexico shooting. Lonnie Swartz is charged with firing multiple shots from the Arizona side of the border into Nogales, Mexico more than five years ago and killing Rodriguez. (AP Photo/Anita Snow)
FILE - This April 2, 2017 file drone photo shows the U.S.-Mexico border fence on the outskirts of Nogales in southern Arizona. A U.S. border patrol agent is going on trial for second-degree murder in U.S. District Court in Tucson on Tuesday, March 20, 2018, in a rare Justice Department prosecution of a fatal cross-border Mexico shooting. (AP Photo/Brian Skoloff, File)
In this Dec. 4, 2017 photo, a portrait of 16-year-old Mexican youth Jose Antonio Elena Rodriguez, who was shot and killed in Nogales, Sonora, Mexico, is displayed on the street where he was killed that runs parallel with the U.S. border. A U.S. border patrol agent is going on trial for second-degree murder in U.S. District Court in Tucson on Tuesday, March 20, 2018, in a rare Justice Department prosecution of a fatal cross-border Mexico shooting. Lonnie Swartz is charged with firing multiple shots from the Arizona side of the border into Nogales, Mexico more than five years ago and killing Rodriguez. (AP Photo/Anita Snow)
FILE - This April 2, 2017 file photo made with a drone, shows the U.S. Mexico border fence as it cuts through the two downtowns of Nogales, Ariz. A U.S. border patrol agent is going on trial for second-degree murder in U.S. District Court in Tucson on Tuesday, March 20, 2018, in a rare Justice Department prosecution of a fatal cross-border Mexico shooting. (AP Photo/Brian Skoloff, File)