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The former Hibs, Rangers and Celtic player has hung up his boots at the age of 40.
Funeral procession passes Partick Thistle's stadium before service attended by Nicola Sturgeon.
Mr Weir, who won £161m in the EuroMillions in 2011, died on Friday after a short illness.
Mr Weir and wife Chris, from Largs in North Ayrshire, claimed the £161m prize in July 2011.
