Doncaster Knights prop Ian Williams passed away on Tuesday after collapsing during a training session.
The 27-year-old moved to the Knights last year from the Rotherham Titans. He had made six appearances for the club.
‘Ian collapsed at training at Castle Park this morning and, despite the best efforts of the emergency response team, could not be resuscitated,’ read a statement on the Knights website.
Williams attended Oxford University and impressed during the 2013 Varsity Match against Cambridge, which saw him selected for Wales Students.