MADISON, Wis. — A 15-year-old girl who police say killed two people and wounded multiple others at a private Christian school in Wisconsin endured what appeared to be a tumultuous home life marked by divorces, custody battles and a series of court-mandated mediation sessions to resolve disputes over her care, according to court documents obtained by NBC News.

Jeff and Mellissa Rupnow married and divorced twice, during which their daughter Natalie Rupnow would at times travel between her parents’ homes every few days and attend therapy.

They married in 2011 and divorced for the first time in 2014, according to court documents.

The two agreed to joint custody of Natalie, but she would live primarily with her mother, the documents state.

They remarried in 2017, according to their marriage certificate obtained by NBC, but filed for divorce a second time in 2020. Mellissa and Jeff Rupnow again agreed to share custody of Natalie, but this time she would spend “equal time with both parents,” the court documents show. A divorce certificate obtained by NBC News shows their divorce was finalized in 2021.

Natalie Rupnow, who also went by Samantha, shot and killed a teacher and a student and wounded six others during study hall on Monday at Abundant Life Christian School in Madison, Wisconsin, before dying from an apparent self-inflicted gunshot wound, police said. The victims were identified as Erin M. West, 42, and Rubi P. Vergara, 14.

Two students who sustained life-threatening injuries during the shooting remained in the hospital and the other four injured have been discharged, police said.

The FBI detained Alexander Paffendorf, 20, in California earlier this week and ordered him to temporarily surrender his firearms after he allegedly communicated with Natalie Rupnow. Authorities say Paffendorf admitted to discussing plans with Rupnow to arm himself with explosives and target a government building. The FBI uncovered messages between the two but did not disclose their alleged plans.

Paffendorf and his family could not immediately be reached for comment.

The apparent turmoil in Natalie Rupnow’s family life, as documented by court records, offer a glimpse into events that may have shaped her path before Monday’s tragedy.

In 2022, Mellissa and Jeff Rupnow sought mediation for custody of Natalie. That May, Dane County Family Court Services notified the parents of a requirement to attend a “mandatory parent education program via Zoom” due to a “disagreement concerning child custody and/or physical placement.” A month later, according to court documents, Mellissa Rupnow had “been scheduled to attend on June 2nd and June 16, 2022, but did not appear” for the Parent Education Program. Shortly after, the couple was asked to appear for a “mandatory mediation session in person appointment.”

In July 2022, an agreement was reached, granting them joint legal custody of Natalie, who would primarily live with her father, according to court documents. The documents also indicate that the parents agreed to “consider Natalie’s therapist’s recommendations regarding placement” for Natalie during the weekends.

Natalie’s mother agreed to connect with her therapist and “participate in therapy to the extent recommended by the therapist,” according to the court documents. Natalie’s father would make “every effort to schedule therapy appointments” to accommodate the mother’s schedule.

The court documents noted that “the parents report a generally positive co-parenting relationship and will continue to communicate with one another by text messages and phone conversations.”

Jeff and Mellissa Rupnow did not respond to multiple requests for comment. Madison Police Chief Shon Barnes said the two are “fully cooperating” with investigators, who are still trying to identify a motive and have not released many details on the teenager.

“Identifying a motive is our top priority. But at this time, it appears that the motive was a combination of factors,” Barnes said at a news conference.

Trish Kilpin, the director of Wisconsin’s Office of School Safety, said on Monday that “targeted violence is preventable.”

“When somebody decides to use violence, it’s often to redress an upset or a grievance, and they progress down a pathway towards that violence,” Kilpin said. “And when they do that, they often study previous school shooting incidents.”

A neighbor of Jeff Rupnow’s who spoke to NBC News expressed shock when he learned about the shooting and described Jeff as a “kind person.”

“He really helped us out,” said the neighbor, who did not want his name used out of fear of publicity about the case. “I know we’re still trying to piece everything together.”

The neighbor indicated he didn’t know Natalie, saying “the very limited things we knew, it’s horrifying for everyone, obviously, and just horrifying for the families of the school and those kids.”

Selina Guevara reported from Madison, and Chloe Atkins and Daniella Silva reported from New York City.

Madison Police Chief Shon Barnes was named as the chief of police in Seattle on Friday, five days after he was thrust into the national spotlight because of a shooting at a religious school in Wisconsin that killed a teacher and student.

Barnes’ departure comes as Madison police are still in the early days of their investigation into what motivated 15-year-old Natalie “Samantha” Rupnow to open fire at Abundant Life Christian School, killing teacher Erin West and 14-year-old freshman Rubi Patricia Vergara and critically wounding two other students. Rupnow then killed herself, authorities said.

In a statement announcing the decision, Seattle Mayor Bruce Harrell said Barnes has demonstrated “impressive leadership capabilities” during the school shooting investigation.

Barnes was known to be a finalist for the Seattle job before the shooting. He has served as the chief of police in Wisconsin’s capital city since 2021. He also was a finalist to become chief of police in Chicago in 2023 and San Jose, California, in October.

Barnes did not mention the shooting in the statement from Harrell’s office. “My family and I are excited about the opportunity to integrate into Seattle’s vibrant community, known for its diversity, innovation and resilience,” Barnes said.

The Seattle mayor’s office office said Barnes was chosen over two other finalists, an assistant police chief in Montgomery County, Maryland, and a deputy chief in Los Angeles.

Harrell, Seattle’s mayor, reassigned former police Chief Adrian Diaz in May over allegations that Diaz discriminated against women and people of color. Diaz was fired this week after an investigation found he had an intimate relationship with a former television news anchor before he hired her as his chief of staff.

Barnes had long been rumored to be looking to leave the job in Madison, which has a population of about 280,000. Seven months into the position, he told the news outlet Isthmus that despite the rumors he was in the job “for the long haul.” Barnes’ three children and wife continued to live in Illinois, where he previously worked, while he rented an apartment in Madison, Isthmus reported.

Barnes has taken center stage responding to the school shooting with mixed results. His department initially reported that five people had been killed.

Two wounded students remained in critical condition Friday but were stable, UW Hospital said.

Barnes also said at a news conference that the first 911 call came from a second-grade student. A day later, Barnes said it had in fact come from a second-grade teacher.

Barnes has done many interviews with local and national media outlets this week, while defending not releasing more details about the shooter’s motivation or whether her parents may be charged, citing the ongoing investigation.

Madison Mayor Satya Rhodes-Conway on Friday congratulated Barnes on his new job and praised his handling of the shooting.

“I’m grateful that the Madison Police Department responded to this unthinkable crisis with the utmost professionalism and compassion,” Rhodes-Conway said in her own statement.

Barnes is a former U.S. Marine who began his law enforcement career in 2000 with the Greensboro Police Department in North Carolina. He left to become deputy chief of police in Salisbury, North Carolina, from 2017 to 2020. He worked as the director of training and professional development with Chicago’s Civilian Office of Police Accountability starting in August 2020 before coming to Madison as chief in February 2021.