In a Friday June 2, 2000 file photo, forensic anthropologist Dr. Clyde Snow, of Oklahoma, unites parts of a skull, in San Salvador, El Salvador. Snow, who worked on cases ranging from the assassination of President John F. Kennedy to mass graves in Argentina, died Friday, May 16, 2014, at Norman Regional Hospital in Norman, Oklahoma, his wife, Jerry Snow told The Associated Press. He was 86. (AP Photo/Victor Ruiz C, File)

Clyde Snow, a forensic anthropologist who worked on cases ranging from the assassination of President John F. Kennedy to mass graves in Argentina, has died. He was 86.

Snow's wife, Jerry Snow, told The Associated Press her husband died Friday morning at Norman Regional Hospital in Norman, Oklahoma. Jerry Snow says her husband had lung cancer and emphysema.

Snow examined mass graves in countries such as Argentina, Bolivia, Peru and Croatia. He often helped build criminal cases against government leaders who carried out the killings.

He also assisted in identifying victims of the Oklahoma City bombing and the remains of serial killer John Wayne Gacy.

Jerry Snow says her husband will be remembered most for his great sense of humor and dedication to human rights.

In a May 5, 1986 file photo, Dr. Clyde Snow holds a human skull in his office in Oklahoma City, Okla. Snow, a forensic anthropologist who worked on cases ranging from the assassination of President John F. Kennedy to mass graves in Argentina, died Friday, May 16, 2014, at Norman Regional Hospital in Norman, Oklahoma,, says his wife, Jerry Snow. He was 86. (AP Photo/David Longstreet)

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