MIAMI BEACH (CBSMiami) – A homeless man is facing serious charges after police say he attacked a woman on the beach.

On Christmas night, a woman was sitting on the beach by herself when a man, later identified as 29-year-old Robert Reitz, came up from behind and tried to force her to perform a sex act on him.

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She was eventually able to get away when she screamed for help and he ran off.

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The woman said when she reached down to pick up her cell phone from the sand, it was actually a man’s wallet.

She went back to her hotel and reported the attack to the police. Using the wallet, they were able to take Reitz into custody.

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He’s been charged with sexual battery, battery, false imprisonment, and marijuana possession.