KANSAS CITY, Mo. -- The mother of former Chiefs linebacker Jovan Belcher filed a wrongful-death lawsuit against the team Tuesday after exhuming his body so that his brain could be examined for evidence of a degenerative condition linked to repeated concussions. The lawsuit, filed by 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 care before Belcher 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." Belchers body was exhumed at a cemetery in Bay Shore, N.Y., at his familys 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, behavioural 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. Shepherds 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 counselling. According to the lawsuit, Belcher was knocked unconscious during a game against Jacksonville in 2009 but did not receive adequate treatment before returning to team activities. 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 in the parking lot. 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. The Chiefs are already the subject of a workers compensation lawsuit filed on behalf of several former players who claim the Chiefs hid the risks of permanent brain injuries from repeated concussions from 1987-93, when there was no NFL collective bargaining agreement in place. In August, the NFL reached a tentative $765 million deal to settle lawsuits filed by more than 4,500 former players who developed dementia or other concussion-related health problems they say were caused by football. The settlement, subject to approval by a federal judge, would apply to all past NFL players and spouses of those who are deceased. However, several former Chiefs players found a 2005 amendment to the workers compensation statute in Missouri allowing employees to sue employers in civil court if the employees declined workers compensation. The window allowing such suits to be fired was due to expire in December. The lawsuit was originally filed on behalf of five former Chiefs players, but several others have added their names to the case, bringing to 22 the number of players involved. The lawsuit claims the Chiefs ignored decades of scientific research indicating repeated head trauma causes permanent brain damage. It also claimed the Chiefs increased their risks by giving them "ammonia inhalants, caffeine cocktails and/or (anti-inflammatory drug) Toradol to abbreviate the need for concussed employees to miss working time due to a brain injury." Players were even more prone to head injuries, the lawsuit said, because of the concrete-like AstroTurf surface that was in place until 1994 at Arrowhead Stadium. 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In Englands first game since its worst-ever World Cup showing, Roy Hodgsons side rarely looked like scoring against unambitious opposition and the breakthrough in the friendly only came when Raheem Sterling was tripped in the penalty area.NEW YORK, N.Y. - Magic Johnson praised recent activism by professional athletes on Tuesday and called for more conversation among government, law enforcement and black leaders.The basketball Hall of Famer made his remarks a day after Cleveland star LeBron James and other players wore I Cant Breathe shirts before the Cavaliers 110-88 victory at the Brooklyn Nets.Theyre incredible stars that people will listen to, Johnson said at Michael Jordans restaurant in Grand Central Terminal. Im so happy theyre socially conscious ... and they want to use their platform and their voice.James, Kyrie Irving and four Brooklyn players said they were supporting the family of Eric Garner, who died in July after a New York police officer placed him in a chokehold while trying to arrest him for selling loose, untaxed cigarettes. Kobe Bryant and several of his teammates with the Lakers warmed up in the shirts on Tuesday night.A recording of Garners arrest showed him gasping I cant breathe during the fatal encounter, and thousands have protested a grand jury decision not to indict the officer since the announcement last Wednesday.When youre African-American, you grow up understanding that you can be next, Johnson said. So I think theyre doing it in a peaceful and mindful way.Chicago point guard Derrick Rose wore the same shirt Saturday night before the Bulls hosted the Golden State Warriors. Five St. Louis Rams players trotted onto the field in a Hands up, dont shoot! gesture before a Nov. 30 game against the Oakland Raiders in a show of solidarity for protesters and the family of Michael Brown in nearby Ferguson, Missouri.A grand jury on Nov. 24 declineed to indict a police officer in the shooting death of Brown, sparking nationwide protests.ddddddddddddThe great thing about it is nobody is saying that every police officer is bad, Johnson said. The majority are great and they protect us. They put their lives on the line. And not every young African-American kid is bad, either.Johnson said he didnt have negative experiences with police growing up in Michigan, but my friends had issues and my loved ones had issues. So, youve always been affected, even if it wasnt you directly.Young African-American males, its not just the killing, but also being abused and being incarcerated for not doing something wrong, he said. So weve got to correct that.Johnson, a co-owner of the Los Angeles Dodgers, said beyond the protests, the next step is to find common ground among citizens and police. He would like to see a meeting of community and government leaders early next year.Leaders from all sides, the African-American, law enforcement and government side have to come together and say Hey, how can we make this better for all of us? Johnson said.The three-time NBA MVP attended the Steiner Sports event Tuesday in Grand Central, where there has been recent die-ins to draw attention to fatal encounters with police. Among those in attendance were Mookie Wilson, Larry Johnson, Frank Robinson and Dennis Rodman.Robinson, who won baseballs Triple Crown in 1966 and became the first black manager in the major leagues in 1975, said he didnt participate in the athlete activism during his playing days.I didnt get involved in it, my job was to play baseball, Robinson said, and thats what I did. ' ' '