NEW : iReporter A man who heard two shots , then two more . Police say he was confronted by someone from Homeland Security . Autopsy to determine cause of death , police say . McDonald 's employee tells an affiliate she heard two shots , began to run .
NEW : iReporter interviews man who heard two shots , then two more . Police say man was confronted by agent from Homeland Security . Autopsy will determine cause of death , police say . McDonald 's employee tells CNN affiliate she heard two shots , began to run .