Just less than a year after his son's passing, TobyMac remembered his son in a heartfelt social media post.

The Christian artist took to Instagram on Sept. 4, on what would have been Truett Foster McKeehan's 22nd birthday.

"Remembering my beautiful, flavorful, spontaneously hilarious, hard loving son on his 22nd birthday," TobyMac wrote.

"I am proud to be your Dad, Tru ... always was, always will be! And you’re STILL reminding me to breath in the moment. I love you boy."

McKeehan died in Oct. 2019 of an overdose of fentanyl and amphetamines. He was 21 at the time and TobyMac's oldest son.

McKeehan was found dead in his Tennessee home on Oct. 23.

At the time of McKeehan's death, TobyMac was on tour in Canada. His son had also been pursuing a career in music.

Shortly after his son's death, TobyMac released an emotional statement about McKeehan.

View this post on Instagram

Truett Foster Mckeehan had joy that took the room when he entered. He was a magnetic son and brother and friend. If you met him, you knew him, you remembered him. His smile, his laugh, the encouragement he offered with words or even without. He had an untamable grand personality and dreams to match. And he hated being put in a box. He expressed himself through the music he made. And by made I mean, written, recorded, produced, mixed, and designed the art. All of it. A true artist. His first show was a week ago, and it was nothing short of electric. Everyone felt it, everyone knew it. He could’ve easily taken the easy route and put music out when he was 12, 14, 16, even 18, but he always said he wanted to live some life and have something to say before he did it. He didn’t want to be a child star, he wanted to be a man with scars and a story to tell. I always admired, respected and encouraged that stand. Truett always had a soft spot for God. The Bible moved him. His heart was warm to the things of his King. He was by no means a cookie cutter Christian but give me a believer who fights to keep believing. Give me a broken man who recognizes his need for a Savior every time. That’s who Truett was and how he should be remembered. My last moment with Truett in person was at his first show this past Thursday at the Factory in Franklin, Tennessee. I had to leave the next morning very early to fly and start our Canadian tour. As I stood in the audience and watched my son bring joy to a room, I was as proud as a “pop” (as tru called me) could be. It was the culminating moment of a dream that he had since he was 12. It couldn’t have been sweeter. Our music, and what we say lyrically couldn’t be more different, but the outcome was much the same… offering a room full of people a few minutes of joy in a crazy world. Our last text exchange is shared above (swipe). My wife and I would want the world to know this... We don’t follow God because we have some sort of under-the-table deal with Him, like, we’ll follow you if you bless us. We follow God because we love Him. It’s our honor. He is the God of the hills and the valleys. And He is beautiful above all things.

A post shared by TobyMac (@tobymac) on

"(He) had joy that took the room when he entered. He was a magnetic son and brother and friend," TobyMac wrote. "If you met him, you knew him, you remembered him. His smile, his laugh, the encouragement he offered with words or even without. He had an untamable grand personality and dreams to match. And he hated being put in a box.

"He was by no means a cookie cutter Christian but give me a believer who fights to keep believing. Give me a broken man who recognizes his need for a Savior every time. That’s who Truett was and how he should be remembered."