According to Life and Style magazine, the actor showed up unannounced with his 15-year-old daughter, Maya. During their visit, the duo played guitar and sang Christmas carols.
One of the hospital patients, Sonya Clarke, told the New York Daily News that she will never forget the visit because of Maya's "soothing voice."
While Clarke spends every three weeks in the hospital for chemo therapy to treat her lymphoma, she says "situations like this make you see what's important and who is important."
The hospital later thanked Hawke and his daughter for spending time with their patients.
A big thanks to Ethan Hawke and daughter Maya for the wonderful music they brought to patients throughout NYM today. pic.twitter.com/TNMA3M2fF8— New York Methodist (@nym_hospital) December 23, 2013