Joe Kinnear, the former Wimbledon and Newcastle United manager, died at the age of 77.
Kinnear, who formerly coached Luton Town and Nottingham Forest, was diagnosed with dementia in 2015.
His family wrote in a statement, "We are sad to announce that Joe passed away peacefully this afternoon surrounded by his family."
Kinnear, who was born in Dublin, earned 26 Republic of Ireland caps over an 11-year playing career.
He began his career with Tottenham, where he made 258 appearances and scored twice over ten seasons.
Kinnear won the FA Cup, the League Cup twice, and the UEFA Cup with Spurs.
He joined Brighton in 1975, but retired after just one season on the south coast when a knee injury curtailed his career.
Kinnear's first role in management was with India's national side in 1983, before a stint with Nepal in 1987.
He returned to English football with Doncaster Rovers in March 1989 but left at the end of the season having won just once in 11 matches.
Kinnear's next role came with Wimbledon two-and-a-half-years later and he would spend more than seven years in south-west London.
Inheriting the 'Crazy Gang' in January 1992, Kinnear guided Wimbledon to a sixth-place finish in his second full season in charge at the club, helping him to win the 1994 LMA Manager of the Year award.
He registered two further top-10 finishes in the Premier League, but suffered a heart attack in March 1999 that saw him step away from the club.
Kinnear returned to management with Luton Town in 2001 and enjoyed a brief spell with Nottingham Forest after over two years with the Hatters.
The Irishman ended his managerial career with a short and controversial spell at Newcastle United.
Following Kevin Keegan's resignation just a month into the 2008-09 season, Kinnear was appointed caretaker manager after a failed search for a permanent successor.
In his opening news conference, he swore more than 50 times in front of the attending media and his spell lasted just 18 games before he stepped down following further heart problems.