Christopher Barbour has been on death row in Alabama since 1994
It is not clear how the man killed himself and why it wasn't stopped by correction officers
Scotty Gardner went gambling with two of his friends after strangling his girlfriend Heather Stubbs to death with a cord from a curling iron
Byron Black was executed yesterday (August 5) in Tennessee
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Edward Zakrzewski was executed on July 31 via lethal injection
His execution marked the ninth made in Florida this year
Michael Bell was executed last week, and has reinvigorated talk around death row
Death row inmate Byron Black is set to be executed next month
One death row inmate has said the new scheme has given him hope
British grandmother Lindsay Sandiford has been on death row since 2012
Lindsay Sandiford is a grandmother-of-three, and she has told a cellmate what she wants to happen if she is executed
54-year-old Michael Bernard Bell is the latest death row inmate to be put to death
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The death row inmate's execution date has been set by a judge in Utah
Byron Black is scheduled to be executed on August 5 at the Riverbend Maximum Security Institution in Nashville
Richard Gerald Jordan was put to death on June 25
Thomas Lee Gudinas' execution in Florida marks the seventh person put to death in the state this year
Stephen Stanko's last meal was out of the ordinary for a killer
Stephen Stanko, who committed a trio of devastating crimes two decades ago, was executed yesterday (June 13)
Not everyone considers it a 'humane' execution method
Anthony Wainwright has been executed for the murder of mom-of-two Carmen Grayheart after breaking out of prison three days prior
Gregory Hunt was pronounced dead more than 25 minutes after the procedure began
The Tennessee inmate took aim at the governor and insisted his innocence
Matthew Lee Johnson was executed via lethal injection earlier this week