The District of Columbia police said its homicide/natural death unit is responding.
Secret Service spokeswoman Cathy Milhoan said the incident occurred on the north fence line, the victim suffered a single gunshot wound and Secret Service personnel did not fire any shots.
Trump has been briefed on the incident, according to White House deputy press secretary Hogan Gidley. The Secret Service put the White House on lockdown after a pair of shots were heard, according to the NY Daily News.
Further information on the incident was not immediately available. Law enforcement officials have identified him but are not releasing his name at this time, as they look for next of kin. Trump is expected to return to Washington D.C. this evening to attend the Gridiron Dinner.
FBI Former Assistant Director Ron Hosko says it's not hard to get near the White House with a weapon.
Law enforcement officers at Lafayette Park across from the White House in Washington, close the area to pedestrian traffic, March 3. A Tennessee woman intentionally rammed her auto into a barrier outside of the White House on February 23.
This is a developing story.