Funeral For A Friend, Lethal Bizzle and Olly Murs also offer their condolences
Cheshire Police confirmed the 42 year-old was found at 07:08 GMT at his house in Huntington, Chester.
The Football Association of Wales (FAW) told the BBC it appeared Speed, killed himself.
R.I.P. Gary Speed. Our thoughts with his family // Leeds Everton Newcastle Bolton Sheffield 85 caps for Wales.
Speed, who was born in Mancot, Flintshire, took over the Wales job in December 2010.
He began his playing career at Leeds United and was part of the side that won the last Football League title in 1992, before the introduction of the Premier League.
Speed went on to play for Everton, Newcastle United, Bolton Wanderers, Sheffield United and he won 85 caps for his country during a 14-year international career.