His passing was announced by an undertaker in his home town of Buckie, Moray.
A post on the Joe Dawson’s Funeral Home page said: “With broken hearts, we announce the passing of Callan, in Glasgow, on Sunday, October 5, 2025, aged 29 years.
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“Beloved fiancé of Megan, cherished son of Malcolm and Lorraine Thain, much loved brother of Evan and a loving grandson, nephew, cousin and friend.
“A celebration of Callan’s life will be held at the Fishermen’s Hall, Buckie, on Wednesday, October 22, at 1pm, thereafter to Buckie West Cemetery, to which all are welcome.
“Family flowers only please, donations if so desired, may be given in lieu, in aid of CRY and Feeling Blue.
“Please wear a splash of red in loving memory of Callan.
“He will be forever in our hearts.”
Friends paid tribute to Mr Thain on the post, describing him as “happy and genuine”.
Richard Charlwood wrote: “Just under ten years ago I was fortunate enough to be introduced to a young man named Callan Thain and tasked with marking his Specialist Portfolio in Biomedical Science.
“I was always impressed by his strong work ethic and during my time marking it I could tell he was going to go far, definitely a future Senior Chief in the making I thought.
“Sadly, Callan passed away last week after taking part in the Great Scottish Run and this tragic event has affected us all deeply.
“Callan was always a happy, genuine young man who always had time for people.
“He would never dismiss you if you needed help.
“He was liked by everyone.
“His passing is a tragedy.
“The world would certainly be a better place if there had been more people like him in it.
“I’ll see you again one day my friend, so sorry that you were taken from us too soon.”
A statement from NHS Ayrshire & Arran said: “We were saddened to hear of the untimely passing of our colleague Callan Thain. We send our deepest condolences to Callan’s family at this time.
“Callan was an outstanding young man and an outstanding scientist. He was a valued and highly regarded colleague and will be sorely missed by so many colleagues across NHS Ayrshire & Arran.”