A U.S. State Department law enforcement agent from the mainland was arrested for fatally shooting a man in his 20s early this morning on Kuhio Avenue in Waikiki, sources said.

Honolulu police identified the alleged shooter as Christopher W. Deedy, 27, and sources who asked to remain anonymous confirmed that he is a federal agent who was off-duty at the time of the shooting. The victim was identified by family and friends as Kaneohe resident Kollin K. Elderts, 23, a Kalaheo High School graduate.

A State Department spokeswoman in Washington, D.C., said only, "We are aware of the incident and we cannot comment on an ongoing investigation."

She would not confirm whether he was here for the Asia-Pacific Economic Cooperation conference which begins Tuesday.

But Deedy’s LinkedIn web page identifies him as a special agent working for the Bureau of Diplomatic Security at the State Department and from the Washington D.C. area.

According to the State Department’s website the bureau is responsible for providing a safe and secure environment for the conduct of U.S. foreign policy. President Barack Obama and 20 other world leaders are expected to attend the APEC Leaders’ Meeting next weekend.

Police say the shooting happened in front of the McDonald’s restaurant on Kuhio Avenue between Royal Hawaiian and Seaside avenues just before 3 a.m. The victim is 23, and is a Hawaii resident, police said.

Deedy was identified and arrested a short distance away at 2234 Kuhio Ave. at 3 a.m. He was being held pending a second-degree murder charge, according to police.

Police said initial indications are that the suspect and the victim, a man in his 20s believed to be a Hawaii resident, did not know each other. The victim’s identity has not yet been released.

Police said four males got into a confrontation and the victim sustained a single gunshot wound. Paramedics took him in critical condition to a hospital, where he died.

Deedy had not been charged as of this afternoon.

His LinkedIn page says he is graduate of Tulane University in New Orleans who worked as an economist with the U.S. Bureau of Labor Statistics before joining the State Department in June 2009.