Krayzie Bone, of the rap group Bone Thugs-n-Harmony, is in a life-threatening condition in hospital after reportedly coughing up blood, according to US media.
Allhiphop.com reported the artist, whose real name is Anthony Henderson, checked himself into a hospital in Los Angeles on Friday.
The publication said the rapper suffered from a condition known as sarcoidosis, which is an inflammatory disease where the immune system overreacts, causing clusters of inflamed tissue called granulomas.
It added Henderson had a CAT scan, which found an artery leaking into one of his lungs, and underwent surgery - but it failed to stop the bleeding.
Sources said he was on a breathing machine and sedated as of Sunday.
Sky News has contacted representatives for Bone Thugs-N-Harmony for more information.
Bandmate Bizzy Bone used his Instagram story to send his warm wishes, writing: "Pray 4 Kray.
"Can't sleep. Sometimes you just gotta pray."
Basketball legend LeBron James is among those sending well-wishes to the 50-year-old. In a post on X, formerly known as Twitter, he said: "Prayers to Krayzie man!!!!".
Fellow rapper Juicy J wrote on X, "Prayers up for Krayzie Bone", while Oscar-winning artist DJ Paul said on Instagram: "Please pray for my brother Kray.
"We was just in the lab Wednesday recording, having fun, drinking his new IPA
"This is unbelievable."
| Bone Thugs-N-Harmony performing in 2019. Pic: AP
Bone Thugs-N-Harmony formed in 1991 in Cleveland, Ohio, and along with Krayzie Bone, is made up of Bizzy Bone, Flesh-N-Bone, Wish Bone and Layzie Bone.
The Grammy-winning group, first signed to Eazy-E's Ruthless Records in 1993, is widely regarded as one of hip hop's most iconic collectives, having worked with the likes of Tupac Shakur and The Notorious B.I.G.