Truett McKeehan passed at the age of 21 last October.
TobyMac lands the second-highest debut of his career on Billboard's Hot Christian Songs chart, which is powered by streaming, airplay and sales data, as "21 Years" arrives at No. 3 on the list dated Jan. 25.
"21 Years" sold 10,000 downloads in its first week, according to Nielsen Music/MRC Data. It launches at No. 1 on Christian Digital Song Sales, marking TobyMac's fifth leader and third No. 1 arrival.
It also attracted 2.1 million U.S. streams in the tracking week and begins at No. 10 on Christian Streaming Songs, becoming TobyMac's fourth top 10.