When the runners in the Alamo 13.1 race take to downtown streets Sunday, there will be one face in the group you won't be able to miss.
Krissy Krotzer, was born with Trisomy 18, a genetic disorder that does not allow her to walk or speak or eat on her own.
Trisomy 18, also known as Edwards syndrome, has a very low rate of survival and it's estimated one percent of children born with Trisomy 18 will live to the age of 10.
But Krissy, now 13 years old, will cross the finish line of her second half marathon in six months, thanks to one San Antonio family.
Larry and Katie Wheat first met Krissy's mother, Terry Krotzer, in 2002, when they discovered their infant daughter, Abigail, had Trisomy 18. She was stillborn at 31 weeks.
Seeking support, the Wheats stayed in touch with the Krotzers, and have stayed close ever since.
When Krissy turned 13, Larry Wheat got the idea to run a half marathon with her in a running stroller.
"That was where I got this idea, that I could do this. Krissy and I could go run, we can get people's attention," said Wheat.
And with that, Krissy and Larry ran their first half marathon together in Portland in October of 2013. Their mission is now called Running With Krissy.
Wheat said getting people to listen to their cause was easy.
"[Krissy] is just a bright light in the middle of whatever group she's in," said Wheat. "She absolutely draws people in, she just has an amazing smile and really gets people's attention. You'll never see a group of people congregate faster than when you push this little girl up into a group."
Katie Wheat said it's a way to preserve their daughter's memory.
"Larry is able to take part in Krissy's life, that we didn't get with our daughter," said Wheat.
On Sunday, they'll not only help Krissy run her second marathon, but raise money for a new racing stroller for her.
The Alamo 13.1 raises money for Ironman For Kids, which supports families and children living with Trisomy 13 and 18.
Katie and Larry Wheat are also the co-founders of "A Butterfly's Touch," which provides support to parents whose lives have been impacted by the loss of a child to early pregnancy loss, stillbirth, or newborn death. The organization also helps lessen financial burdens through a fund to help with funeral and burial expenses.