(CNN)Christian recording artist TobyMac has penned a moving tribute to his late son, Truett McKeehan.

McKeehan, 21, died Wednesday at his home near Nashville, family spokesperson Velvet Kelm told CNN.
A cause of death has not yet been determined.
McKeehan was the oldest of TobyMac’s five children. He was an up-and-coming musician who performed under the names Truett Foster, truDog, TRU and Shiloh.
He collaborated with his father on several albums.