Murphy and Rieder each had a goal and two assists , while Justin Bailey had a pair of goals to lead the Rangers (6-4-1) to their third straight win. Radek Faksa also had a goal and an assist.
Marc Beckstead and Trevor Morbeck replied for the Frontenacs (5-6-0), while Billy Jenkins had two assists.
Kitchener was 3 for 6 on the power play, while Kingston scored one goal in five opportunities with the man advantage.
Rieder opened the scoring in the first period with the Rangers enjoying a 5-on-3 man advantage, deflecting Matt Puempel's point shot.
Bailey then built on the lead with his first OHL goal, taking the puck coast-to-coast before deking Morrison.
After Faksa made it 3-0 on the power play, the Frontenacs struck back with the man advantage as Backstead took a cross-crease pass and snapped it over Gibson.
Just over two minutes later, Kingston got within one on Morbeck's goal, but Murphy gave the Rangers a two-goal cushion, again on the power play, with a blast from the point that hit the crossbar and dropped behind Morrison.
Bailey finished the scoring his second goal of the game midway through the third with a wrist shot that squeaked through Morrison's pads.