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A former boyfriend of a young bookstore clerk whose body was stuffed into a suitcase and dumped in a wooded lot in Greenwich, Conn., has been arrested in connection with her death, the police said on Tuesday.

The man, Javier da Silva, was taken into custody at his home in Queens on Monday night after he used an A.T.M. card that belonged to the victim, Valerie Reyes, 24, of New Rochelle, N.Y., the authorities said.

Mr. da Silva told detectives that on Jan. 29, Ms. Reyes fell and struck her head while they had sex at her apartment, according to a criminal complaint released Tuesday. He said he bound her hands and feet, placed tape over her mouth and put her in a suitcase before driving to “a forest” and leaving the suitcase there, the complaint states.

It was unclear from the complaint if Ms. Reyes was still alive when she was placed in the suitcase. “Javier da Silva is charged with committing a gruesome kidnapping that resulted in the death of a young woman,” Geoffrey S. Berman, the U.S. attorney in Manhattan, said.