Prior to the birth of Spidey, Phineas had faked his death to commence his one final plan. He would discredit this new Spidey by framing him for a crime, then leading him to his demise. He used his robots to kidnap J. Jonah Jameson and brainwash him into believing he was The Chameleon. He then fooled the naive new Spiderman into stealing a prized artifact by hiring a actor to pretend to be a police officer and tell him it was being stolen. Now labeled as a menace, the Tinkerer sent his new Chameleon to lore Spidey to a trap set by him. Tinkerer then slipped into his battle/lifesupport system modeled after Doc Oct's and him and his robots battled Spidey but Spidey proved to strong and he himself didn't know his own strength and in 1 swift attack accidently killed Tinkerer.
Genius level intellect