Swansea City's Besian Idrizaj has died at the age of 22, the club has confirmed.
The former Liverpool, Crystal Palace and Luton Town player passed away in his sleep at his parent's home in Linz. It is widely reported the player suffered a suspected heart attack.
The 22-year-old was under contract at Swansea City at the time of his death.
The Swans signed the former Liverpool striker and Austrian Young Player of the Year on a two-year deal in August from FC Eilenburg in Germany.
He had started his career at LASK Linz in 2003 where he scored three goals in 35 appearances.
His performances during his second season at the Linzer Stadion saw him pick up Austria's Young Player of the Year award and prompted Liverpool to swoop for his signature in 2005.
While he never played a first-team game for the Anfield club, he enjoyed loan spells at Luton Town (2006/07) and Crystal Palace (2007/08).
The Baden-born youngster was loaned out again in January 2008 to Austrian club Wacker Innsbruck before being released by Liverpool.
It was during his time at Wacker that he collapsed on the pitch against Sturm Graz in an Austrian top-flight fixture in February 2008.
It was first thought that Besian had suffered a heart-attack, but the problem was later diagnosed as a virus.
In an interview earlier this year, Besian confirmed: "It was just a virus. It infected me badly, but thankfully it wasn't my heart.''
After a break from the game, it was Swans boss Paulo Sousa who gave the former Austrian Under-21 international the chance to start again.
And while both player and manager knew it would take him time to get back up to full speed again, Besian made three league appearances in the Championship and one in the Carling Cup last season.