Thornton started 32 of the 37 games that he appeared in during his three seasons, but his health was an issue -- he missed 11 games in his three seasons.
To no one's surprise, Thornton spent the majority of training camp and the preseason injured instead of competing against Denzelle Good for the starting right guard position. Thornton has been wearing a boot and using a scooter to get around because of an ankle injury.
Here's a look at how each member of the Colts' 2013 draft class fared:
LB Bjoern Werner, first round: Released during the offseason after three disappointing seasons in which he totaled just 81 tackles and 6.5 sacks.
OL Hugh Thornton, third round: Placed on injured reserve Saturday. Started 32 of 37 games in which he appeared.
OL Khaled Holmes, fourth round: The supposed center of the future for the Colts was released shortly after the team selected center Ryan Kelly in the first round of this year's draft. Holmes, like Thornton, was consistently injured. He appeared in 17 games, starting nine, in his three seasons with the Colts.
DL Montori Hughes, fifth round: Released when the Colts had to trim their roster to 53 in 2015.
S John Boyett, sixth round: Never played a game for the Colts after he was arrested following an incident in downtown Indianapolis.
RB Kerwynn Williams, seventh round: Appeared in only one game for the Colts.
TE Justice Cunningham, seventh round: Appeared in just one game for the Colts