The 43-year-old from Brighouse was diagnosed with cardiomyopathy eight years ago. Unless he gets a heart transplant, he has maybe just a year to live.
His fiancee Steph Greenwood said: “He went to the doctor because he thought he was having a panic attack and they told him it was actually his heart.”
Last month, Darren was put on the transplant list after all other avenues ran out. “It’s the only option,” said Steph.
“They have done everything they can medically.” Tomorrow Steph’s brother
Calvin, from Finkil Street, Hove Edge, is taking part in the Great North Run to try to help Darren.
Calvin, 22, is running for the Cardiomyopathy Association, a charity that provides information and support for families affected by the disease.
The condition causes the heart muscle to be abnormally enlarged, thickened or stiff.
As Calvin warms up in the north-east tomorrow, Darren and Steph will be glued to the TV at home, hoping to see him cross the line.
They cannot make the trip to cheer him on as Darren has to stay near home in case a heart becomes available.
The couple, who have been together for 13 years, got engaged seven years ago.
Earlier this year they decided to start planning their wedding which they hope will take place next year.
Calvin, a keen footballer, has played for Brighouse Juniors, Huddersfield Town’s youth squad and currently Brighouse Old Boys, but this is his first long-distance run.
“I’m pretty fit as I play a lot of sports but I’ve not done distance running.
“When we found out about Darren I just felt I had to do something. I’m not only doing the run for Darren and Steph but for everyone out there who has this disease. I also want to make people more aware of cardiomyopathy.
Calvin, a transport administrator wants to raise £1,000.
To sponsor Calvin, go to http://justgiving.com/calvinlee
For more information call the Cardiomyopathy Association on free phone 0800 018 1024 or see the website www.cardiomyopathy.org.