The name Juan Elias Garcia hardly settled on the FBI's Ten Most Wanted list when the 21-year-old nicknamed "Cruzito" surrendered today at the U.S. Embassy in Managua, a law enforcement official familiar with the matter told ABC News.
The FBI named Garcia one of its most wanted fugitives on Wednesday, putting out a $100,000 reward for information leading to his capture.
He was wanted for the 2010 execution-style murder of a 19 year old woman and her 2 year old son in Central Islip, NY, officials said.
Garcia is alleged to be a member of the violent Mara Salvatrucha gang, known as MS-13, and is from El Salvador.
"MS-13 is the most violent gang here of any of the street gangs,” said Special Agent Reynaldo Tariche, who investigated the case with other members of the FBI’s Long Island Gang Task Force.
While gang-related murders are not uncommon on Long Island, "the execution of a 2-year-old and his mother is a new low even for MS-13," Tariche added.
Garcia, who was 17 at the time of the murders, had a romantic relationship with the victim, Vanessa Argueta. She had ties to a rival gang. The two had a falling out and the FBI said it was decided to retaliate against her, authorities said.
"They were going to kill her for disrespecting the gang," said Special Agent James Lopez. "It is unacceptable for MS-13 members to have girls they associate with be involved with rival gang members."
The circumstances of Garcia's arrest weren't immediately known, but a source familiar with the matter said the addition of his name on the Ten Most Wanted list made a difference.
Since it was established in 1950, 501 individuals have been named to the list -- the vast majority of which have been apprehended or located.