>> shannon: in 2019, his 21-year-old son truett died of accidental overdose. >> my heart is shattereddid before? it felt really strange to me and it felt so sad. ♪ >> ain't no doubt about you. >> shannon: he channeled the grief into new songs to help millions of listeners find midst in their own suffering. >> you guys were so gentle with me, i wrote a song "faithfully," it talks about when my world broke into pieces, you were there, when i cried out, jesus made a way for me. i wrote about that, it was very dear song to my heart about how god is kind to me and the hardest place and deepest valley. >> shannon: have you heard from other people? i have to imagine they have been so touched by this music? >> yeah, i've heard from a lot of people that have lost loved ones. i wouldn't want to be the guy that wrote that song that met them where they were, but i'm that guy. and god is going to use everything, i believe that. >> this is my hometown. >> shannon: toby mac was born toby, in fairfax, virginia and shot to fame for dc rock, with classmates while studying at liberty university. at 58,