The Christmas Eve fire that killed 21-year-old Kayla Corrigan at her family's Needham home started in the garage, but investigators could not pin down a single cause.

The Massachusetts Department of Fire Services announced Monday, Sept. 14, that the blaze at 28 Woodworth Road has been classified as undetermined. Multiple accidental ignition sources were present in the garage, and none could be ruled out, according to Boston.com.

Department of Fire Services public information officer Jake Wark said the cause is undetermined "due to multiple potential ignition sources," but "all the potential sources are 'clearly accidental.'"

The fire began before 5 a.m. on Wednesday, Dec. 24, 2025, in the rightmost of three bays inside an attached garage at the 6,500-square-foot, three-story home on Woodworth Road, a private way off South Street near High Rock Street. Wark said investigators found power tools, ignitable liquids, the remains of lithium-ion batteries and an electrical outlet with a power strip in that bay.

Two other adults escaped the fire.

Corrigan, a Syracuse University senior studying marketing management, was found dead inside the home. She was a 2022 graduate of Newton Country Day School of the Sacred Heart and had moved to Needham with her family from Wisconsin in 2007. She had been due to graduate in spring 2026.

The four-alarm blaze drew 75 firefighters from across the region and took more than seven hours to bring under control. Deputy Chief Steven Guiney served as incident commander and struck the second alarm, which brought equipment from eight other departments to the scene. One firefighter received a shock from solar panels on the roof but was not seriously injured.

"This was overwhelming. It was a seven-hour fire fight. It was a lot," Needham Fire Chief Tom Conroy told the Needham Observer in late December 2025, describing the response.

The investigation involved the Needham Fire Department, Needham Police Department, the State Police Fire and Explosion Investigation Unit assigned to the State Fire Marshal's office, and State Police assigned to the Norfolk District Attorney's office. It included scene examination and witness interviews, according to Wark.

A GoFundMe campaign organized by family friend Amy Lund for Corrigan's mother Christa and sister Alyssa had raised more than $180,000 as of late December 2025.

WCVB first reported the investigation's conclusion. The case is now closed.