From ABC News:
Reno police say the man they arrested for allegedly raping and murdering a 19-year-old college student [Brianna Denison] may be responsible for other sexual assaults in the area and in Washington state.
Reno Police Lt. Robert McDonald told ABCNews.com that they were led to James Michael Biela, 27, after an anonymous tipster called earlier this month to report that Biela's girlfriend, the mother of his 4-year-old son, had found another woman's underwear in his truck's console.
While this arrest cannot undo the violence done, it can prevent further violence. The DNA match has been made, after Biela refused to voluntarily give a DNA sample, so I believe the police have arrested the right suspect.
He was also charged with a rape of another woman. The attempted kidnapping of yet another woman is also linked via DNA, but no charges have been made for that attack yet.
Since the underwear were found in a different vehicle (Biela sold the one which matched the police description) the police want to know who owns the underwear. Biela moved to Washington State shortly after Denison's body was found so the police are looking to see if there are more victims in Nevada and Washington.