On July 16, 2013, after not tendered a new contract with the Islanders, Riley signed as a free agent to a one-year AHL contract with the St. John's IceCaps.[3] He established an AHL career high with 21 points in 71 games before serving as an Alternate captain in his second season with the club in 2014–15.
As a free agent, Riley signed a one-year contract with his sixth AHL team the Stockton Heat, an affiliate of the Calgary Flames, on September 4, 2015.[4]
After 7 seasons within the AHL, Riley left North America as a free agent to sign a one-year deal with Northern Irish EIHL participant, the Belfast Giants on August 8, 2016.[5] On July 6, 2019, Riley signed for Belfast's league rivals Cardiff Devils.[6]
On October 7, 2020, Riley announced his retirement from hockey after 10 professional seasons.[7]