Despite the coroner's findings, several conspiracy theories suggesting murder or accidental overdose have been proposed since the mid-1960s. Many of these involve President John F. Kennedy and his brother, Robert, as well as union leader Jimmy Hoffa and mob boss Sam Giancana. Owing to the prevalence of these theories in the media, the office of the Los Angeles County District Attorney reviewed the case in 1982, but found no evidence to support them and did not disagree with the findings of the original investigation.