(CNN) The suspect in Saturday's fatal attacks on sleeping homeless men in Manhattan's Chinatown neighborhood has been charged with four counts of murder, according to NYPD Detective Ahmed Nasser.

The suspect was identified as 24-year-old Randy Rodriguez Santos, who is also homeless, police said.

Santos, who police said has been arrested at least six other times, has also been charged with attempted murder and unlawful possession of marijuana, Nasser said.

Santos was arraigned in New York City Civil Court Sunday and held without bail. His next court date will be Friday, according to Justin Henry, a Manhattan District Attorney spokesperson.

Santos' defense counsel, Arnold Levine, did not immediately respond to a call and email for comment.

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