[ cheers and applause ] >> this one-mile march is to raise money for the maria fareri children's hospital in new york's westchester county. it's also raising awareness about the need for transplant donors. that's why it's so special that 11-year-old tyler is here. this is not the first walkathon for tyler. the last time he joined this event, he was just hours from undergoing surgery for a new liver. >> i was really sick, you know? so i had to get a liver transplant. >> tyler had been battling a liver disease for years, and it was getting worse. to get a donated liver, you need to be on a national list. for tyler, time was running out. the hospital's medical team worked hard to get him moved to the top of the list. even so, the wait took more than a year. >> and every day we were just waiting. is today going to be the day? is today going to be the day? >> [ sighs ] it's heart-wrenching. you're always waiting, looking at the phone, waiting to get that phone call. and when the phone call actually came in, i think i just sat on the phone speechless, no words coming out of my mouth, and tyler