Doddie's death was six years after he was diagnosed with motor neurone disease.
He raised millions through his My Name'5 Doddie foundation after he was diagnosed with Parkinson's disease.
The lock was made an Officer of the Order of the British Empire in the year 2019.
He is survived by his family.
Kathy wrote that Doddie was an inspiring force of nature.
We are fortunate to have shared our lives with him and we have many fond memories, including his love and warmth, his support and advice, and his terrible jokes. It's hard to say how much he will be missed.
Doddie's spirit and determination was never taken byMND. Even though his battle may be over, his fight continues through his foundation until a cure is found for all those with this devastating disease.
We want to thank everyone for their support and for respecting our privacy at this difficult time.
After playing for Stewart's Melville and Melrose, where he won six titles, he went on to play for the likes of Border Reivers andNewcastle.
He made his Scotland debut against Argentina.
He scored two tries against New Zealand in the 1995 World Cup, but lost to the All Blacks in the quarter-finals.
He was selected for the British and Irish Lions in 1997 but his tour of South Africa was cut short due to injury.
He received a rapturous reception from the crowd when he appeared at Murrayfield with the match ball.
He made an emotional on- pitch appearance with his three sons against the same opponents.
The Helen Rollason Award is given to the best sports personality of the year.