The execution of Delbert Tibbs was a highly controversial event that took place in Florida in 1974. There were many people who believed that Tibbs was innocent of the crime he was convicted of, and they worked tirelessly to try to get his sentence commuted. However, their efforts ultimately failed and Tibbs was put to death by electric chair.
There are a number of reasons why Del's execution wasn't stopped. Firstly, there was a lot of evidence against him - including eyewitness testimony - which made it very difficult to argue that he was innocent. Secondly, the Supreme Court had already rejected an appeal from Tibbs, meaning that there wasn't much legal recourse left. Finally, by the time his execution date came around, public opinion had turned against Tibbs and many people believed that he deserved to die for his crime.
Ultimately, the combination of all these factors meant that Del's execution went ahead as planned despite the protests of those who thought he was innocent. It's a tragedy that someone may have been put to death for a crime they didn't commit, but unfortunately in this case there wasn't enough evidence or support to save him.