The National Oceanic and Atmospheric Agency has closed its case against Robert F. Kennedy Jr., dropping its allegations that he transported the body of a dead whale from Massachusetts to New York decades ago, keeping the animal’s skull in his home.

The claim that RFK Jr. transported the whale was first made by his daughter, Kathleen “Kick” Kennedy, in a 2012 magazine article published by Town & Country. The investigation was closed on Oct. 16, with a NOAA spokesperson saying authorities “determined the allegations to be unfounded.”