Associated Press staff photographer Nick Ut

Nick Ut won a Pulitzer Prize for this photo of Phan Thi Kim Phuc, center, as she and other Vietnamese children fled an aerial napalm attack on June 8, 1972.

Nick Ut, left, and Kim Phuc Phan Thi, UNESCO goodwill ambassador, visit the exhibit “War/Photography: Images of Armed Conflict and Its Aftermath” at L.A.’s Annenberg Space for Photography in 2013.

Nick Ut on assignment at Echo Park Lake on July 15, 2014.

Nick Ut finds that Maria (aka Mario) the Goose is not quite ready for his closeup while meeting the press at the Los Angeles Zoo in 2011.

Nick Ut on assignment at a crime scene in Altadena on July 6.

Nick Ut, on assignment at Pasadena’s Jet Propulsion Laboratory, shows Juno Spacecraft engineer Elsa Jensen a photo on June 9.

Nick Ut shoots a news conference at the Los Angeles County Sheriff’s Department headquarters on May 26, 2015.