Philip D. Chism allegedly became upset at Danvers High School teacher Colleen Ritzer when she started talking about Tennessee, the state the teenager had recently moved away from after his parents’ “stressful’’ divorce there, according to a police affidavit unsealed today.

Chism, 14, also allegedly left behind a note after raping and murdering Ritzer, a popular math teacher at the North Shore school, last month.

“I hate you all,’’ said the handwritten, folded note, which was found near Ritzer’s body in the woods near the school, according to the affidavit.

According to authorities, Ritzer was attacked in a second-floor bathroom at the school. When her body was found in the woods, her throat cut, police discovered that her attacker had “sexually staged” her body and partially removed her clothing. Evidence of a sexual assault was found on the body, according to the affidavit by State Police Trooper Robert C. LaBarge Jr.

Chism was indicted Thursday by an Essex County grand jury on a charge of first-degree murder as an adult. He also was indicted as a youthful offender on charges of aggravated rape and armed robbery for allegedly using an object in the sexual assault and stealing Ritzer’s credit cards, underwear, and cellphone.

The youthful offender charges will initially be handled in juvenile court, but Blodgett’s office will seek to have all the charges tried in Superior Court.

Chism is due to be arraigned in Essex Superior Court on the murder charge Dec. 4. He is currently being held without bail at a Department of Youth Services facility.

LUNENBURG — School Superintendent Loxi Jo Calmes announced Monday that all remaining games for the Lunenburg High School football team — including the popular Thanksgiving game Nov. 27 against St. Bernard's High School in Fitchburg — have been forfeited in the wake of an alleged racist hate crime targeting a young player.

The Lunenburg team is now the focus in racial graffiti discovered Friday morning spray-painted on the house of 13-year-old Lunenburg player Isaac A. Phillips, who alleges wrongdoing by teammates.

Ms. Calmes thanked the community for attending a vigil Sunday night and for supporting Isaac and his family who were the targets of an "act of hate." She said the district will continue to make its resources available to assist the family.

She also confirmed an investigation into allegations related to racial slurs by Lunenburg players directed toward Worcester South High Community School football players a few weeks ago.

"The educators and coaches of Lunenburg value diversity and we care deeply about all of our students," Ms. Calmes said. "We have no tolerance for racism in any form and we do everything we can to eliminate it from our schools and our community. Numerous members of the faculty and staff were in attendance at the vigil (Sunday) night along with the entire football coaching staff and team. We have also sought out the assistance of the Anti-Defamation League to assist us in delivering additional educational programs for students to teach tolerance."

She would not respond to follow-up questions from reporters.

BOSTON (AP) — A chemist at a Massachusetts drug lab who allegedly admitted faking test results in criminal cases is expected to plead guilty to obstruction of justice, perjury and tampering with evidence charges in a scandal that has jeopardized thousands of convictions.

Annie Dookhan of Franklin has a change-of-plea hearing scheduled for Friday in Suffolk Superior Court. She initially pleaded not guilty to a total of 27 charges.

State police shut down the state Department of Public Health lab she worked at after discovering the extent of Dookhan's alleged misconduct.

Prosecutors said Dookhan admitted "dry labbing," or testing only a fraction of a batch of samples, then listing them all as positive for illegal drugs, to "improve her productivity and burnish her reputation."

Since the lab closed in August 2012, at least 1,100 criminal cases have been dismissed or not prosecuted because of tainted evidence or other fallout from the lab's closing.

Prosecutors from state Attorney General Martha Coakley's office recommended a sentence of up to seven years in prison, while Dookhan's lawyer recommended a sentence of no more than a year.

Judge Carol Ball said in a written memo that she would impose a sentence of no more than three to five years if Dookhan decided to change her plea to guilty.