Scotland wing Sean Lamont will leave the Scarlets to re-join Glasgow Warriors at the end of the season.
Lamont's contract is up at the end of the 2011/2012 campaign after he joined the Parc y Scarlets outfit in 2009.
The Scottish star made his 50th appearance for the region in the Heineken Cup defeat in Munster.
"This was genuinely a very difficult decision and having spoken to Andy [Robinson] at Scotland, it's probably the right move for me now," he said.
"And it gives me the chance to take my young family back home and that's important to me personally.
"Out of respect for the Scarlets jersey and my fellow team-mates, the region and supporters can be sure I will be giving my all to the rest of this season's campaign.
"We have some big and intense games ahead of us in both the league and Heineken Cup and I look forward to the chance to show how important this club has been to my career."
Lamont will return to the Warriors with his brother and fellow Scottish international Rory, who has also re-joined the Scottish club after leaving Toulon.
The Scarlets' powerful winger joined the Scarlets two years ago after a spell at Northampton. He was with Glasgow between 2003 and 2005.
"I am very grateful for the opportunities I've been given at the Scarlets," said 30-year-old Lamont, who has won 60 caps for Scotland.
"It's been an excellent time for me and one of the best moves of my career to join such a positive and energetic team environment and the chance to play a brand of rugby I thrive on and enjoy.
"I would like to express my sincere thanks to Nigel Davies and the coaching team at the Scarlets for all they have done to support me as a player.
"The opportunities I've had in the Scarlets shirt for the past three seasons have re-ignited my enjoyment and spirit for rugby and have no doubt enhanced and promoted my international career."