First, let me say that Guns is completely correct. You are an idiot for letting that monster get into play. What you should have done is take a phone book, and beat the player with it until he stops trying to break the game.
Now that you have to clean up your mess, without thinking hard, here are my ways to beat the human tank:
Stunbolt/Manabolt - Watch the player's reaction when his walking tank gets taken down on the first initiative pass.
Control Thoughts/Actions, Influence - Watch the other players beat the offending player after the group gets wiped because someone had no Willpower to resist mental influence.
Demolish Cyberware spell - 'Nuff Said.
Gas grenades, full of your toxin of choice - Because cyberlimbs don't help against poison.
Hacker - Seriously, this guy is just BEGGING to be hacked.
Infected - Low essence, you say? Well, that will make him easy pickings for this vampire over here...
Bugs - The guy is likely to be overconfident. Turn that against him. Go to a meet, Stunbolt. He wakes up in a coccoon, and gets to sit there waiting to be invested while the rest of the group has to decide whether they save him or not.
Police/Corpsec - Check his license/SIN for the cyberware and weapons regularly, pretty much any time he's walking openly outside the Barrens. Just getting to a meet should have him stopped by the cops at least once. Treat the same as some idiot walking down the street in milspec armor.
Viruses - Viruses can be a lot of fun. Two really fun things would be one that inverts all his controls, so to move his right arm up he has to think about moving his left leg to the side, and so on, and one that makes Grimmy pop up and ask if he'd like help with every complex, standard, move, or free action he takes, EVERY SINGLE TIME, regardless of the settings. And he must answer verbally, every time, or it keeps asking, in his AR (set so others can see/hear it).