Sheton broke into the Castleford Tigers first team in 2004
St Helens have signed Castleford centre Michael Shenton for next season on a three-year deal.
The 24-year-old has been a regular in the Tigers line-up since 2005 and has played for England eight times.
"Michael is one of the best young rugby league talents in England," said St Helens chairman Eamonn McManus.
"Although, already an established international, we feel that his best years very much lie ahead of him and that he will flourish at St Helens."
McManus added: "He has size and speed and will compliment our back line very well."
Shenton has shown his versatility as he has played on the wing for Castleford and has scored eight tries for the club this season.
"Although it's a real wrench for me to leave Castleford, I feel that St Helens present a perfect opportunity for me to develop my rugby league career at the highest level," he said.
"They have a long and great record of success and play a brand of rugby that will suit me. It's a very exciting time to be joining the club and I'm really looking forward to the challenge."