Ex-Cardiff and Barnsley defender Chris Barker has died, his former management company has confirmed.
The 39-year-old was lead professional development phase coach at Forest Green.
"It is with great sadness that we learn of the untimely and tragic passing at the age of 39 of Chris Barker," agency World In Motion tweeted.
"Chris was a client throughout his outstanding playing career of over 500 League games for clubs including Barnsley, Cardiff City, Queens Park Rangers and Plymouth Argyle.
"Moreover, Chris was a wonderful person, an absolute gentleman and a pleasure to work for."
Barker made 180 appearances for Cardiff during a five-year spell after joining from Barnsley in 2002.
He also had spells at Stoke, Colchester, QPR, Plymouth, Southend and Aldershot.
Tributes have also come from Barker's former team-mates.