Reyes' body was found inside a suitcase last Tuesday along a road in Greenwich, Connecticut, according to police, who said her hands and feet were bound.
DeSilva was arrested after he fraudulently used an ATM card belonging to the victim, Valerie Reyes, Berry said.
"We are confident that the pursuit of justice for Valerie will be successful and we continue to work with the family to provide closure to this tragedy".
In a press conference on Tuesday Greenwich Police said that de Silva confessed to playing a role in the murder when he was questioned following his arrest.
The Greenwich Police Department announced the arrest of an individual "believed to be involved" in Reyes' death.
Police say they have examined hundreds of hours of surveillance footage in the case and interviewed several potential witnesses. "I'm paranoid, mummy. I'm getting anxiety attacks.' She was having a hard time talking".
DeSilva "is charged with one count of kidnapping resulting in death, which carries a sentence of death or life imprisonment", Nicholas Biase, a spokesman for the Office of the U.S. Attorney for the Southern District of NY confirms to PEOPLE.
Police said previously that Reyes did not die at the location where she was found, but they did not know where she was killed.
According to the New York Police Department, Reyes suffered from depression and anxiety.
"She said, "Mami, his mother has cancer and I want to support him.' She was an angel like that", Reyes" mother, Norma Sanchez said.
Said Sanchez: "We wonder, 'Who made her feel this way?'"
"I'm afraid someone is going to murder me", she recalled her daughter saying.
The Connecticut Office of the Chief Medical Examiner has yet to release the autopsy results to rule the cause of death. "And she said, 'No, '" Sanchez said.