Closing arguments are expected this week in the trial of U.S. Border Patrol agent charged in the 2012 fatal shooting of a teenager across the Mexican border.

Lonnie Swartz is charged with second-degree murder in the death of 16-year-old Jose Antonio Elena Rodriguez.

[RELATED: Military desertion is issue in border agent's murder case]

Story Continues Below

The trial began March 20 in U.S. District Court in Tucson.

Prosecutors say Swartz fired 16 shots, hitting the teen 10 times including eight times in the back.

[RELATED: New details emerge in fatal border shooting of Mexican teen]

Elena Rodriguez was on a street in Nogales in the Mexican state of Sonora, just across the border from Nogales, Arizona.

Swartz says he fired in self-defense in response to people throwing rocks from the Mexico side during a drug-smuggling attempt.

[RELATED: Vigil calls for justice in cross-border shooting]

Prosecutors don't dispute the teen was throwing rocks, but contend Swartz responded with an unreasonable amount of force.

Click/tap here to download the free azfamily mobile app.

© 2018 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.