Dear Ms. Sniegowski,
Thank you for posting your request on History Hub!
To request a search for records of the Federal Bureau of Investigation (FBI) pertaining to the case, please file a Freedom of Information Act (FOIA) request with the FBI. For instructions, please visit their website at Requesting FBI Records. If the case file has been transferred to the U.S. National Archives, the FBI will provide you with the file number necessary to request the file from the Archives.
Since the original crime took place in Canada, you also may wish to contact the Royal Canadian Mounted Police.
We hope this information is helpful. Best of luck with your research!