The 29-year-old veteran began his career at Rushton Park and played 92 games for Peel between 2005 and 2011, before swapping blue and green for the Sharks’ classic blue and white combo.
He played 105 WAFL games for the Sharks.
The Sandover, Lynn and Tuckey medallist said he was excited to play his final years of footy for the club where it all began for him.
“I’m really looking forward to mentoring and being a part of the development of the young guys at the club,” he said.
“It’s going to be an exciting 2016. The location and being closer to home was definitely a part of the appeal. I am looking forward to spending more time with my wife and kids.”
Thunder coach Cam Shepherd was thrilled with the club’s acquisition of the former Pinjarra product and state representative.
“We are really pleased that Rory wants to continue his career at Peel in 2016 and beyond,” he said.
“His experience and training ethic will be invaluable to our young list. We are committed to consolidating our position following our first finals campaign in 2015 and believe that Rory can be a part of our continued on-field success.”