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A college student was killed on Saturday during a track and field meet in suburban Chicago.

Friends gathered at a vigil at Wheaton College in Wheaton, Ill.  said the student was named Ethan Roser.

They said Roser was killed during a track and field event hosted by Wheaton College on Saturday afternoon.

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Witnesses said Roser was hit in the head with a "hammer," which is a heavy metal ball attached to a thin wire. In men's events, the hammer weighs 16 pounds. In women's, it weighs almost 9 pounds. It is not clear which type of hammer was involved in the tragic accident.

Friends said that Roser was a freshman on the soccer team. He was volunteering at the meet.

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