Matthew Wilson suffered serious injuries in his lower extremities in the crash early Friday morning and was flown by medical helicopter to Tufts Medical Center.
Witnesses told police that speed may have been a factor in the crash. There have been at least 7 motorcycle fatalities in New Hampshire this year, according to the DMV Fatal Crash Unit.
The Plaistow Fire Department said the fire was its fourth fire of the week including the nine alarm fire at Michael's Oceanfront Motel in Salisbury early Monday morning.
The Essex County District Attorney's Office told Seacoast Current that a death connected to the crash is under investigation but did not disclose details.
Superintendent Brian Cochrane asked anyone with concerns about the safety of the school community to contact a member of the school or administration and not to rely on social media for information.