After a 14-month investigation, homicide detectives arrested Herring Wednesday at Cal State Northridge, where he worked as a recruiter for the school.
Herring had been considered a suspect early in the case, but police are not saying what evidence led to his arrest. They will only say that Herring had not cooperated fully with authorities during their investigation.
The couple had been married for 10 years and argued the day before they disappeared. Herring had publically denied any responsibility in his wife's disappearance.
"Couples have discussions about many things all the time, so it was nothing out of the ordinary, but I really can't put a finger on it," Herring told Eyewitness News in a March 2009 interview. "I enjoy the warmth of my wife. I enjoy everything about her, and I just really miss her right now."
Davis has yet to comment publically about the arrest in hers sister's case. Davis is best known for her roles in "Friday Nights Lights" and "South of Nowhere."
Cal State Northridge is not commenting on the arrest other than to confirming that Herring worked at the university.
Herring is being held at the metro jail in downtown Los Angeles on $1 million bail, and he is scheduled to be arraigned Friday.