Double K, who served as one-half of the rap duo People Under The Stairs, has passed away. He was 43.

In the early hours of Sunday morning (Jan. 31), tributes to the fallen artist began pouring in on Twitter. As of this report, the cause of death had not been revealed. Nonetheless, fans and fellow artists alike proceeded to honor the late rapper.

“Not Double K,” rapper Psalm One said of the late emcee. “What a dope persona and artist. One of my first big national tours PUTS was gracious enough to take me out. Double K was a fucking west coast pioneer. This is tough. Prayers up for K, his family, and Thes. REST IN POWER DOUBLE K.”

Double K, born Michael Turner, connected with his rapping partner Christopher Portugal a.k.a Thes One to form People Under the Stairs in 1997. The L.A. duo release their debut album The Next Step in 1998. They went on to put out 15 albums including three compilations of material that didn’t make their studio albums. The duo released their final album Sincerely, The P in 2019 before formally disbanding shortly afterward.

During their tenure, People Under the Stairs were vital to the underground scene on the West Coast. However, the group did receive some mainstream love until the end of their career. Thanks to Double K’s time as a member of the Funk Mob, the duo got to work with the legendary George Clinton. They also worked with other hip hop veterans like Jurassic 5 and Hieroglyphics.

People Under the Stairs also managed to inspire other well-known artists like the late Mac Miller. In 2011, Mac dropped his mixtape I Love Life, Thank You which includes the song “People Under the Stairs, which pays homage to the duo. Check out more tributes to the late Double K below.