What we know about Tamura’s life, how he got the assault rifle that he used to kill an NYPD officer and three others, and the ...

The sons of the NYPD officer killed in the Park Avenue mass shooting idolized their dad, showing him off to classmates and ...

The progressive brain disease can be caused by repeated trauma to the head and has caused serious health problems for ...

Police say a gunman who killed four people in a Manhattan skyscraper before taking his own life claimed to have a brain ...

“CTE is linked to repetitive brain trauma and has a distinct pathology that can only be diagnosed at autopsy,” says Dr. Ross Zafonte, a principal investigator of the Football Players Health Study at ...