He played college football for the Boise State Broncos and was selected by the Rams in the third round of the 2011 NFL draft.
Pettis finished his Boise State career as the school's all-time leader in both receptions (229) and touchdown catches (39).
Pettis set career highs with 71 receptions and 951 yards and 10 touchdowns as a senior and earned First-team All-Western Athletic Conference honors for the second consecutive year.
As a junior, in 2009, Pettis had 63 receptions for 855 yards and 14 touchdowns and was a First-team All-WAC selection.
In a week 7 loss against the Green Bay Packers in 2012, Pettis caught his first NFL touchdown pass, a 3-yard reception.