Slade Wilson (Earth-1: Pre-Crisis)

Slade Wilson, also known as Deathstroke, was the former friend of Oliver Queen. He was on Lian Yu. He turned on Oliver, becoming his enemy after he had taken Mirakuru. While on Mirakuru, he blamed Oliver for the death of Shado.

Biography
On December 10, 2019, he was killed along with the rest of the multiverse, by antimatter.