Kennedy Jr. is under federal investigation for an incident involving a dead whale that dates back two decades. The National Marine Fisheries Service confirmed the probe, which follows allegations that Kennedy cut off the head of a deceased whale and transported it home.

A federal law enforcement agency confirmed it’s opened an investigation into Robert F. Kennedy Jr. after he allegedly cut off the head of a dead whale and took it home two decades ago.

Katherine Silverstein, a spokesperson for NOAA, told the Times that the federal agency typically does not comment on open investigations.