PHOENIX - Authorities said Tuesday that they may never truly know why a 15-year-old boy shot and killed his 16-year-old ex-girlfriend last week before turning the gun on himself.
During a Tuesday press conference, Phoenix police Sgt. Tommy Thompson said Matthew Bolton did not have a history of violence, but that Anastasia Greer did report to school officials that she was afraid he was going to hurt a former girlfriend.
Bolton shot and killed Greer on Friday in front of a friend's house before shooting himself.
According to Thompson, Greer told school officials on Thursday that she thought Bolton was going to hurt another female classmate because of things she was saying.
School officials interviewed the girl, who said she was unaware of any specific threats, but was afraid of Bolton. The classmate reportedly told officials that Bolton had previously punched her in the legs, causing her to bruise.
The girl's mother was called and picked her daughter up from school that day.
Police on Friday said there were unconfirmed reports of a possible gun on campus. Thompson said students were tweeting about it, but no weapon was ever found. During the course of the investigation, Matthew's name was brought up.
Police called his mother, who confirmed that her son was not at school on Friday, but was at home with his 28-year-old older brother. Police later discovered the brother owned the gun used in the deadly shooting.
Later that day, Bolton visited Greer and a friend at a home near 43rd Avenue and Happy Valley Road.
According to police, the friend asked Greer if she had a weapon prior to meeting Bolton outside, and gave her a knife.
It is unclear what transpired during the confrontation between Bolton and Greer, but Thompson said Greer was running away from Bolton when she was shot. Police previously said the two had recently broken up.
Thompson said they still do not have a clear motive as to why the boy shot the girl, and admitted that they may never know. However, police said that school officials took appropriate action.