By Liam Buckler Death row killer Kenneth Smith has been executed using a controversial nitrogen gas method after surviving his first lethal injection attempt. The 58-year-old became the first-ever inmate in the USA to be put to death by toxic gas following an execution at Alabama’s Holman Correctional Facility. His official time of death was recorded at 20:25 on Thursday, 25 of January. Speaking ahead of his death, Smith said: “I am not ready for that. Not in no kind of way. I’m just not ready, brother.” The state of Alabama had predicted in federal court filings that the nitrogen gas would “c…