Murrell, 26, joined the Robins ahead of the 2006 season and was part of the team that won National League 1, to earn the club promotion to Super League, scoring a try and a drop goal in the Grand Final victory over Widnes.
Chairman Neil Hudgell said: “Scott Murrell is hugely popular within the club, and the game generally. He is of course a survivor from our National League days, and was a try scorer in that Grand Final success over Widnes. I would like to personally place on record my thanks to Scott for all his efforts down the years and he will always be welcome here. I am sure our fans will, at the right time, give him the send off he deserves.”
A former Leeds junior, Murrell is the second longest-serving player at the club having made more than 150 appearances in the red and white.
He suffered an arm fracture in the defeat against Bradford on Friday, ruling him out for at least the next two weeks.