HONOLULU -- Honolulu police arrested a man whom they said held up "Lost" actor Josh Holloway.

Ruben Royce was already behind bars at Oahu Community Correctional Center on charges in a separate burglary case.

Police arrested the 21-year-old man on Wednesday on one count of first-degree robbery.

Six months ago, the TV actor and his wife were held up at gunpoint at their Hawaii Kai home.

Police said Royce stole the couple's credit cards, money and car.

"We cannot go into the details yet again because the charges are still pending. However, we can say it was due to the diligence and hard work of the detectives who really had to put the case together," police Capt. Frank Fujii said.

Royce has two previous felony convictions for auto theft, plus misdemeanor convictions for domestic violence and parole violation.

If convicted in the robbery case, he would face up to 20 years in prison.