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Further autopsy details, including results of toxicology tests, will be released in a final investigative report, which may take up to 90 days to complete.

The medical examiner’s office said it was awaiting a decision by the family on whether to turn over Seau’s brain to unidentified outside researchers for study.

Boston University’s Center for the Study of Traumatic Encephalopathy has analyzed the brains of dozens of former athletes, including that of former Chicago player Dave Duerson, who shot himself in the chest last year.

While saying it was saddened by Seau’s death, center officials would not say if they have reached out to the Seau family or would be interested in studying his brain.

Duerson’s family has filed a wrongful death suit against the NFL, claiming the league didn’t do enough to prevent or treat concussions that severely damaged Duerson’s brain before he died in in February 2011.

Former Atlanta Falcons safety Ray Easterling, who had joined in a concussion-related lawsuit against the league _ one of dozens filed in the last year _ shot himself last month at age 62. His wife has said he suffered from depression and dementia after taking years of hits.

Seau is not known to have been a plaintiff in the concussion litigation.

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AP Sports Writer Jimmy Golen in Boston contributed to this report.