Sixteen months after a woman said she was raped by a security guard in her Boca Raton apartment, DNA evidence led to the arrest of her alleged attacker, according to a police report.

Joshua Robertson, 36, faces charges of sexual assault and burglary. He was released on $50,000 bail from the Palm Beach County Jail on Friday.

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In December 2015, a woman went with her boyfriend to the Boca Raton Police Department to report a rape. She said she was with friends in her apartment when two security guards came to her door and asked for her specifically — which she told police she thought was weird since she didn’t know them. They then told her to keep the noise down. She and her friends left the apartment soon afterward.

She said she returned around 4 a.m. to get a cellphone charger and noticed one of the two security guards at her apartment. The guard, later identified as Robertson, followed the woman into her apartment without her permission, then into her bedroom, where he held her down and raped her, according to the report.

Video surveillance footage shows Robertson going up the stairs that leads to the woman’s apartment in the same time frame when the woman told police she was raped, according to the report.

Robertson told police he had a lawyer and would not speak with them. Then his lawyer said he’d give a written statement, according to police. Soon afterward, the lawyer said he would not be saying anything at all and that his client denied any sexual contact with the woman.

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Police spoke with the other security guard on duty that night. He said the two of them did go to the apartment for a noise complaint earlier that evening. Hours later, the security guard said the woman was smoking on a balcony and asked if they wanted to join her. They declined. Soon after that, the woman left with friends again, but then came back to look for something in her apartment, according to the report. The security guard said Robertson followed her. Less than 10 minutes later, Robertson was back at the desk and said the woman started talking her clothes off. The security guard said he told Robertson, "I hope you didn’t do anything."

The woman had a physical examination at the Butterfly House at Wellington Regional Medical Center and her underwear also was taken as evidence. A warrant was issued to get Robertson’s DNA. Then the evidence and his DNA were sent to a crime lab for testing.

It wasn’t until this month that the results came back from the lab and confirmed DNA found on the woman’s underwear matched Robertson, the report said. He was arrested April 13, according to jail records.

Robertson, whom the police report lists as living in Deerfield Beach, also was arrested in March on charges of organized scheme to defraud, according to Palm Beach County court records. The case remains open.

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