He reappeared as a recurring villain in the second season where it was revealed that Mr. Sinister took his shattered body, brought him back to life, but significantly brainwashed him and put some implants in him.
He reappeared as a recurring villain in the second season where memories of his death drove him steadily mad. Eventually, it was revealed that Mr. Sinister took his shattered body, brought him back to life, but significantly brainwashed him and put some implants in him.