Derek Boogaard’s family has filed a wrongful-death lawsuit against the National Hockey League, The New York Times reported Sunday.

The newspaper reported the family claims in the lawsuit that the NHL is responsible for the brain damage that Boogaard sustained during six seasons as an enforcer in the league, and for his addiction to prescription painkillers.

NHL Deputy Commissioner Bill Daly told The Associated Press in an email Sunday night that league has not received the lawsuit and generally does not comment on pending litigation.

Boogaard was found dead of an accidental overdose of pain medication and alcohol on May 13, 2011. He was 28. He was posthumously diagnosed with chronic traumatic encephalopathy, a degenerative brain ailment that is caused by repeated blows to the head.