The lawsuit, filed on behalf of Cheryl Shepherd in Jackson County (Mo.) circuit court, alleges Belcher was subjected to "repetitive head trauma," and that the Chiefs failed to provide adequate medical treatment before Belcher tragically killed his girlfriend and then committed suicide last December.
Shepherd is seeking a jury trial and judgment "in excess of $15,000 for actual damages, punitive damages, and/or aggravating circumstances, for the cost of this action, and for such relief as the court deems fair and reasonable."
Belcher's body was exhumed at a cemetery in Bay Shore, Long Island at his family's request earlier this month so that his brain could be studied for chronic traumatic encephalopathy, a degenerative neurological condition. CTE has been linked to multiple concussions and includes symptoms such as memory problems, behavioral changes and eventually dementia.
CTE has made headlines in recent years with the deaths of some former professional athletes, including former Chargers linebacker Junior Seau and former Bears safety Dave Duerson.
Shepherd's lawsuit claims the Chiefs failed to warn her son of the short-term and long-term risks of concussions; failed to identify and remove Belcher from practice or games after sustaining head trauma; failed to educate Belcher about concussions; failed to monitor or treat Belcher for neurological dysfunction; and failed to provide appropriate counseling.
On Dec. 1, 2012, Belcher shot to death his girlfriend, Kasandra Perkins, while Shepherd was caring for his infant daughter in a nearby room. Belcher then sped from the residence to the Chiefs training facility, where he shot himself in the head as team personnel tried to stop him.
A spokesman for the Chiefs told The Associated Press on Tuesday night that the team was aware of the lawsuit. He could not comment further because of the pending litigation.