A Sheffield man, aged 30 and a Rotherham man, 35, were both detained by officers this morning after a series of raids across the county.
Police carried executed warrant at addresses in Hackenthorpe, Stradbroke, Aston, Ulley, and Wales.
The pair are currently in police custody being questioned by detectives.
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Mr Ward was found with serious injuries after reportedly being attacked on the morning of Thursday, October 1, 2015, at his home on Salisbury Road in Maltby.
He was immediately taken to hospital where he remained in a critical condition for a number of months. He continued to receive medical treatment however he unfortunately died as a result of his injuries on Tuesday, 23 February this year.
Anyone with any information is urged to police on 101.