Parrish was a member of the Dumfries Running Club, where he was club champion in 2022.
He began running in his late teens before building up to racing in his early 20s, taking part in a series of local 5km and 10km races.
Parrish later joined the marines and previously spoke of using running as a way of decompressing from the demands of the job.
After leaving the service, he began competing in Parkruns and walked the Cape Wrath Trail in 2021.
Parrish was photographed running the 2023 Cape Wrath event by No Limits Photography.
The company’s owners, Harriet D’Alessio and Christiaan Le Roux, paid tribute to him on Tuesday.
“David has always been such a joyful person and an inspirational ultra marathon athlete to spend time with,” they said.
“The world and the sport will be a far lesser place without him.”
