White officer on trial in fatal shooting of Antwon Rose, 17

A white police officer who shot and killed an unarmed black 17-year-old last year goes on trial starting Tuesday in a case that could put him behind bars for life. Lawyers for Michael Rosfeld, 30, are expected to argue that the June shooting of Antwon Rose II after a traffic stop in East Pittsburgh was justified. Prosecutors say Rosfeld, who is charged with criminal homicide, gave inconsistent statements about whether he believed Rose had a gun.

The shooting was captured on video by bystanders and posted online, triggering protests in the Pittsburgh area last year, including a late-night march that shut down a major highway.

Read MORE: ABC News