Andrew Luck is staying, but Stanford defensive end Thomas Keiser is not.
Keiser, a redshirt junior, announced Thursday that he will enter this spring's NFL draft.
Keiser, a native of Wexford, Pa., started all 13 games for the Cardinal and finished with 38 total tackles, including 9.0 sacks. A two-year starter, he recorded 109 total tackles, including 19.5 sacks among his 31.0 tackles-for-loss, in 38 career games (28 starts).
With Keiser leaving, the Cardinal now must replace four members of its front seven.
Keiser is the fifth Pac-10 player to announce the he will enter the draft. The others are:
Akeem Ayers, LB, UCLA
Jurrell Casey, DT, USC
Tyron Smith, OT, USC
Shane Vereen, RB, California
If we're thinking Pac-12, you could also add Utah cornerback Brandon Burton to that list.