Authorities in Las Vegas have issued a warrant to obtain the DNA of soccer superstar Cristiano Ronaldo to see if it matches that found on a dress of a woman who has accused him of rape, according to a law-enforcement official with knowledge of the case.

The authorities sent the warrant recently to the court system in Italy, where Ronaldo plays soccer, the official said.

Las Vegas police reopened the case in the fall after the woman, Kathryn Mayorga, filed a lawsuit alleging that Ronaldo raped her in 2009 in Las Vegas and then paid her $375,000 to keep it secret.

Ronaldo and his attorneys have repeatedly denied the rape allegations. Police are gathering all possible evidence before they turn over the case to the Clark County District Attorney’s Office, which will decide whether to file charges.

An expanded version of this report appears on WSJ.com.

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