Former St Johnstone team-mates Alan Main, Stevie May and Bobby Barr were among those to also pay tribute on Twitter.

BBC: Former footballer Darren Wilcox dies from cancer aged 21

Tuesday evening's documentary explains how Alexander's departure for what at the time was an unspecified illness came days after it was announced that goalkeeper Alan Main would not play for the club again.

BBC: SPORT | Football | My Club | Gretna | Worn-out Alexander explains exit

On that basis, people might think that the main responsibility of Alan Greenspan, today's Fed chairman, is growth.

ECONOMIST: Dial M for money

The main reason it was dreamed up (by Alan Guth, a cosmologist at the Massachusetts Institute of Technology) was to explain the extraordinary uniformity of the universe.

ECONOMIST: Cosmology

The main beneficiary of the mud-slinging has been Alan Garcia, a populist former president.

ECONOMIST: A murky democratic dawn in post-Fujimori Peru