Dominican Republic cyclist Leonardo Grullon has died after he and four other cyclists were hit by a truck while training for the Panamerican championships. The Dominican Cycling Federation says 24-year-old Grullon was struck when an unidentified truck driver apparently fell asleep and ran into the group in a mountainous community northwest of Santo Domingo. Grullon died on Thursday. Federation spokeswoman Ana Lebron says four of the five cyclists were members of the national team, including Juan Carlos Polanco, who is critically injured. The group expected to travel to Mexico for the championships starting on April 30. 