Later that month, Oakland police briefly detained Hans Reiser, served him with a search warrant on his person, and obtained a DNA sample. On October 10, 2006, following the second search of his home, Oakland police and Homeland Security Investigations (HSI) investigators removed a number of items. HSI had been investigating Reiser for money laundering. Police announced that they were now treating the disappearance as a homicide case, and Reiser was arrested for the murder of Nina Reiser, and subsequently charged.