He was born in Oranjestad, Aruba, an island of the Dutch Antilles. His given name was Segundo Jorge Adelberto Ecury, but he went by the nickname Boy and it is by that name that he is remembered.
After a brief stint at a military academy in Puerto Rico, together with his brother, he was sent to live in the Netherlands.
Ecury graduated with a diploma in commerce from the Brother of St. Louis School in Oudenbosch, and he and Nicky did a lot of traveling around the Netherlands. They were living there when World War II started in 1939 and witnessed first hand the Nazi invasion in 1940. They also saw the destruction of cities like Rotterdam.
While in the Dutch city of Tilburg, Ecury became friends with another young man, Luis de Lannoy, also from the Antilles, who was part of an underground resistance group in the city. The group carried out sabotage operations, planting bombs on German trucks and roads. Members of the underground movements also went out of their way to help injured Allied troops and civilians who needed help.
Ecury sometimes went along and helped out on covert operations and later became a member of the Resistance Council in Oisterwijk. Like his resistance colleagues, Ecury had to live a life in hiding, and lived in various places around the Netherlands, working on a number of dangerous missions.
Some members betrayed their colleagues, and many of them were captured by the Nazis, including Luis, who was imprisoned and tortured in Utrecht. Ecury tried, but was unsuccessful in his attempts to free his friend. Luis later managed to escape.
On 5 November 1944, Ecury, who had been also betrayed, was arrested and taken to the Scheveningen prison. He was interrogated and tortured, but refused to betray his friends. On the following day, he was executed by a German firing squad. He was 22 years old.
His father brought his son's body back from the Netherlands and in 1947 he was given a funeral with military honors. Two years later, a statue of the local hero was erected in the town and still stands today. He is also the subject of an exhibition in the town's war museum and his former family home houses the Archaeological Museum. Forty years after his death, Ecury was posthumously honored by the Dutch government and awarded a Resistance Heroes Commemorative Cross.
Boy Ecury and his father's quest for the truth about his son's last years were subject of the 2003 movie Boy Ecury by Dutch film director Frans Weisz.