Sixty correctional officers and prison staff say a Missouri man who faces execution in April should be granted clemency. Brian Dorsey is scheduled to die by lethal injection on April 9. The 51 year old was convicted in the 2006 killing of his cousin Sarah Bonnie and her husband Ben Bonnie in New Bloomfield, in central Missouri. He has served most of his sentence at Potosi Correctional Center, about 70 miles south of St. Louis. Dozens of former and current employees with the Missouri Department of Corrections signed onto a letter urging Missouri Gov. Mike Parson, a Republican who has allowed ni…