"In 2014, there were 3,927 inmate deaths in state (3,483) and federal (444) prisons, up slightly from 3,879 in 2013. This is the largest number of inmate deaths reported in state and federal prisons since the Deaths in Custody Reporting Program (DCRP) began collecting data in 2001. […] Illness remained the most common cause of death in state prisons, accounting for 87% of deaths in 2014. From 2013 to 2014, the number of deaths among state prisoners due to illness declined 2%, from 3,082 to 3,031 deaths. AIDS-related deaths increased 23% during the period and respiratory disease deaths increased 20%. The number of suicides in state prisons increased by 30% from 2013 to 2014. This increase followed a 6% decrease from 2012 to 2013. Suicides represented 7% of all deaths in state prisons in 2014, the largest percentage of deaths due to suicide since 2001. Data in this report were developed from the Bureau of Justice Statistics' (BJS) DCRP, an annual data collection of inmate deaths in local jails and state prisons. The DCRP is the only national statistical collection that obtains comprehensive information about deaths in adult correctional facilities. This report covers deaths that occurred in state prisons between 2001 and 2014. It includes information on cause of death, selected decedent characteristics, and prisoner mortality rates by state. Federal data presented in this report are based on aggregate counts from the Bureau of Prisons."
Bureau of Justice Statistics: https://www.bjs.gov