With the Rams' offense continuing to struggle, coach Jeff Fisher has relieved offensive coordinator Frank Cignetti of his duties.
Cignetti will be replaced by Rob Boras, who had the title of assistant coach/offense while also coaching tight ends.
Boras, 45, was strongly considered for the offensive coordinator position by Fisher during the offseason.
Under Cignetti, the Rams rank 31st in total offense through 12 games and are 32nd in passing offense.
"He's a good man," Fisher said. "He worked hard. But we scored 13 points or less in seven of our eight losses. ... I've never done this kind of thing before.