Northern Arizona University police have filed a formal complaint against 18-year-old freshman Steven Jones, charging him with second-degree murder in the campus shooting that left one dead and three injured last week.

Initially, Jones was charged with first-degree murder in the death of 20-year-old Colin Brough, the Associated Press reports. Police said Jones had not acted with premeditation, however, and downgraded the charge on Wednesday.

From the AP:

The complaint also expands the number of assault charges against Jones, 18, from three to six—two for each of the three students injured in the shooting. Two of the injured students, Nicholas Prato and Nicholas Piring, have been released from the hospital. The condition of Kyle Zientek is unclear.

Jones told police he shot the group of students only after they hit him in the face and chased him, according to court documents. Prosecutors said his account was self-serving and alleged Jones was the aggressor.

According to the Arizona Republic, Jones was a pledging membership to the Sigma Chi fraternity. All of the victims were members of the Delta Chi fraternity. However, officials said there is no evidence that the confrontation was related.

In a statement issued on Tuesday, Sigma Chi Executive Director Michael Church said that the fraternity had “removed Steven Jones from the chapter’s pledge program after his arrest and suspended the operations of the chapter while we conduct a thorough investigation into the incident.”

Image via AP. Contact the author of this post: brendan.oconnor@gawker.com.