Unsealed indictment says Ryan Wedding tracked down witness who was then murdered before he could testify

US authorities have charged a fugitive former Canadian Olympic snowboarder turned drug kingpin with the murder of a witness who was prepared to testify against him.

The attorney general, Pam Bondi, said on Wednesday that Ryan Wedding was accused in a newly unsealed indictment of tracking down a witness in Colombia who was then murdered before he could give evidence.