%mlink(STRY:; PHOTO:; AUDIO:%)

FREDERICK, Md. (AP) _ Harold Weisberg, a researcher whose books challenged the official findings about the John F. Kennedy and Martin Luther King Jr. assassinations, has died. He was 88.

Weisberg died Thursday of cardiovascular disease.

Weisberg's 1965 book, ``Whitewash,'' challenged the Warren Commission's conclusion that Lee Harvey Oswald acted alone in shooting Kennedy. He wrote six more books on the subject.

Weisberg also wrote ``Martin Luther King: The Assassination,'' which concluded James Earl Ray was framed for King's murder.

His quest for information from government agencies produced documents that filled 60 file cabinets.

``I don't think I've ever seen anybody as dedicated to a topic as he was to this. He was just tenacious about it,'' Linda Hoffman, Weisberg's grandniece, said Friday.

Born in Philadelphia, Weisberg worked for the Wilmington (Del.) Morning News and the Philadelphia Ledger. He also was a Senate committee investigator and served in the Army as an analyst for the Office of Strategic Services, a forerunner of the Central Intelligence Agency, during World War II.