A graduate with Navy SEAL training led the voluntary, supervised workout on Sept. 16. Nine players were hospitalized, with the last one discharged Wednesday.

All nine members of the Tufts University men’s lacrosse team who were hospitalized this month with the rare muscle injury rhabdomyolysis have been discharged, and the university says it has hired experts to investigate what led to so many serious injuries after a training session.

Twelve players on Tufts University men’s lacrosse team were diagnosed with rhabdo after a "voluntary, supervised 45-minute workout" led by an alum.