NEW : The wounded agent was released from the hospital , officials say . Comment: He is the third agent to die in the line of duty this year . President Barack Obama called the agent 's family to offer condolences .
NEW : The wounded agent was released from the hospital , officials say . The agent who was killed is identified as 30-year-old Nicholas Ivie . He is the third agent to die in the line of duty this year . President Barack Obama called the agent 's family to offer condolences .