From the New York Times:

Joran van der Sloot, the Dutchman who became notorious as the prime suspect in the disappearance of an 18-year-old Alabama woman in Aruba in 2005, pleaded guilty in a Lima courtroom on Wednesday to the 2010 murder of a Peruvian woman he met at a casino. The case of the American woman, Natalee Holloway, who vanished during a senior class trip, remains unresolved despite being the subject of several books and television programs, as well as many lurid tabloid headlines over the years. The Peruvian woman, Stephany Flores, 21, was strangled in a Lima hotel room five years to the day after Ms. Holloway's disappearance. "I am truly sorry for this act," Mr. van der Sloot told the judges on Wednesday, according to The Associated Press. He bowed his head as his lawyer argued that he had killed Ms. Flores in a state of "extreme psychological trauma" brought on because he was "persecuted" during the Holloway investigation. Prosecutors have asked for a 30-year sentence.

It appears he was psychotically paranoid, and that could be related to the torrent of accusations that he murdered Natalee Holloway. Or, it could just as easily be evidence that he is pathologically violent when it comes to young women.