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A video of a nurse comforting a dying patient by singing her a song is going viral.

Megan Smith shared a video of nurse Olivia Nuefelder singing to Smith’s mother, Margaret, at Vanderbilt University Hospital in Nashville, Tennessee.

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According to WXIN, Margaret, 63, has been suffering from liver cancer for about a year. Doctors say she had become too sick for a liver transplant.

Nuefelder comforted Margaret by singing “Dancing in the Sky” by Dani and Lizzy as her anesthesia wore off. The video has been viewed more than 4.5 million times.

“Words cannot describe the appreciation and love we feel for nurse Olivia, who Mom calls her angel,” Smith wrote on Facebook.

According to WSMV, Margaret was later moved to a nursing home. She died a few days later.