SACRAMENTO COUNTY (AP) – A man serving a life sentence for fatally shooting seven people at a small Northern California vocational college has died in prison.

The California Department of Corrections and Rehabilitation said Wednesday that 50-year-old One Goh died at California State Prison-Sacramento on March 20. CDCR spokeswoman Vicky Waters said a cause of death hasn’t been determined. She did not respond to requests for more details.

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Goh was also convicted of injuring three people during the April 2012 shooting at the Christian-affiliated Oikos University in Oakland. Police said Goh was angry with school administrators for expelling him and refusing to refund his tuition.

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Goh pleaded no contest to murder charges in 2017 after a judge declared him mentally competent to stand trial after previously finding him unfit in 2013 and 2015.

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Copyright 2019 The Associated Press.