Craig M. Gruber was a bassist known for his work with Rainbow, Elf, and Black Sabbath. He played a key role in Ritchie Blackmore’s Rainbow (1975) and worked alongside Ronnie James Dio in Elf. Gruber’s later career included projects like ED3N with Jeff Fenholt and Manowar’s David Shankle. These efforts were less commercially recognized, though.
Craig Gruber’s Cause of Death

Gruber passed away on May 5, 2015, at the age of 63 after battling prostate cancer. According to Louder Sound, he spent his final six months under the care of Faith Tabernacle Church members in Florida. During this time, the church community supported him through his illness. They announced the bassist’s death, writing, “Our friend and brother in Christ, Craig Gruber is now with Jesus. He passed away about 3.20pm. Thank you all for your prayers of faith.”
Who Inherited Craig Gruber’s Money?

Gruber’s estate was inherited by his two sons, Graham and Justin, who are listed as his primary beneficiaries. His surviving family also includes his sister Carol and brother Keith, as well as several in-laws: Ralph & Rose Jordan, Alis, Kenji, Gene, and Christine. His financial and musical assets—including royalties from Rainbow, Elf, and Black Sabbath recordings—were passed down to his heirs.
Gruber’s musical career includes bass work on Rainbow’s debut album and songwriting contributions, including his involvement in Black Sabbath’s ‘Die Young’ (pre-production sessions).