Persistence does not always pay off: Stalker waits under bed for two days.

WASHINGTON D.C. -- A stalker hid under a woman's bed for two days -- just for the chance to be alone with her. How he got the keys to her house is the scariest part, and it's a serious reminder of the need to be cautious before handing over your keys.

The disturbing video shows the convicted stalker carefully hiding his video camera on a desk in the victim's bedroom. When he hears the woman and her boyfriend come in the apartment, he disappears under her bed. Carlo Castellanos-Feria remained there for two days until he was discovered by the victim's boyfriend.

"In a lot of ways, [it's the] stuff of an urban nightmare," said Ken Wainstein, U.S. Attorney.

The nightmare started at Holy Cross Hospital where the victim met her stalker who was working as a parking valet. In court, the victim told the judge that the discovery of the valet in her bedroom was in her words -- a horrible experience.

"Her life is dramatically changed. She is fearful when she hears strange noises she doesn't know where they are coming from. Her husband, who was her boyfriend at the time of the incident, now has to be careful not to approach her from behind because it just startles her," said Keri Barta, prosecutor.

Moments before he was sentenced, Castellanos-Feria apologized:

"I fell madly in love and that blinded my judgment. I beg your forgiveness."

Judge Herbert Dixon handed down a three-year sentence, including treatment for mental illness and sex crimes. Court documents show the Hyattsville man had a change of clothes, condoms, a power cord and latex gloves with him under victims bed at the time of his arrest. He was a parking valet with an unnerving obsession.

"He got access to her keys. He then took that opportunity to get those keys copied. That's something we should all think about next time we leave our keys somewhere," said Ken wainstein, U.S. attorney.

When investigators searched Carlo Castellanos-Feria's home, they found vacation photos of his victim and a wedding video. Investigators later determined the items were stolen from her ex-husband's home.

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