History
At one point, workers on a Roxxon platform in Galveston found a mysterious source of energy.[1] Walsh wanted it and ordered his men to extract it and discovered that it could be contained in human bodies, he brought various subjects to his scientists to use as containers.[1] After his daughter Zoe detonated part of Roxxon's Houston office with a missile, David sent his men to pick her up. The Scarlet Spider who was investigating Roxxon swooped into his office for answers, but Walsh gave the Rangers the task of arresting him.[2] David later went with gunmen to the oil rig where Mammon was to kill the heroes and take Zoe to the asylum, but when Mammon attempted to steal his daughter's body, he pushed her away and was possessed in Zoe's place.[1] The Scarlet Spider freed him from Mammon, but after the experience David ended up in a coma.[1]
Personality
David is greedy and devoid of any regard for human life. Despite this he seems to sincerely love his daughter.
Trivia
•In the Walsh family there have been cases of mental illness and in fact Zoe is clearly insane, however David seemed to believe that his daughter had inherited her mental disorders from her mother.