The AP is reporting that a suspect, a 13-year-old boy, has been arrested regarding the death of Columbia grad student Minghui Yu. He is reportedly being charged with second-degree manslaughter, but his name has not been released.

UPDATE (1:15 PM): According to The Daily News and Gothamist, the police now suspect that the boys who assaulted Yu did not intend to mug him.  From the DN: “We don’t believe it was robbery,” a police source said. “It was some sort of altercation.” The DN also has a witness saying that the 13 year old boasted “Look what I do to this one” before attacking Yu.

The NY Post reports that “Yu struggled with at least one of the teens, who punched him in the face, while the other kept watch, witnesses told police.”

The police are still searching for the second teenager.

UPDATE (1:40 PM):  The New York Times has a story up now, highlighting Yu’s involvement in the Chinese Students and Scholars Association. Quote from the article: “‘This area is very dangerous,’ said Hyun Kim, a Columbia graduate student…’It could happen to anyone living in this area.'”