Willie Nelson paid tribute to his late friend Merle Haggard onstage days after he passed away. At a recent tour stop, the Red Headed Stranger performed "It's All Going to Pot" while in Cape Girardeau, Mo.

Joining Nelson on the stage was Jamey Johnson, who sang Haggard's parts within the song, which was released on Nelson and Haggard's joint project Django & Jimmie last year.

While Nelson enlisted Johnson's help on the song, singer Melonie Cannon soon joined in, as did Nelson's son, Lukas, and harmonica player Mickey Raphael for a spirited performance in memory of their old friend.

Haggard passed away on April 6 at the age of 79 after a series of health struggles. Nelson paid tribute to his friend and frequent singing partner on Facebook with a photo and link to a video of their most famous collaboration, 1983’s "Pancho & Lefty."

"He was my brother, my friend. I will miss him," Nelson wrote.

Haggard canceled tour dates several times over the past few months. In December of 2015, he learned he had double pneumonia. In an interview with Willie’s Roadhouse on Sirius XM, Haggard revealed he was "nearly dead" when he was hospitalized for two weeks. Earlier this year, Haggard also canceled shows scheduled for Jan. 30 and 31 after his double pneumonia returned. Then, in March, he announced he was canceling all of his scheduled shows for April on doctor's orders.

Haggard's manager, Frank Mull, confirmed that the country legend died of pneumonia at 9:20AM on April 6 — his 79th birthday — in Palo Cedro, Calif.

Country Stars Remember Merle Haggard

Merle Haggard Dead at 79