There's two items you'll need to get this one done.
- Screwdriver - You'll see the handyman as you head towards the stairs. This is where the screwdriver is.
- Matches - These are on the table beside Gene. You need to stand behind him and take them as he'll see you otherwise.
Interact with the oven in the kitchen with the screwdriver to mess with it. Gene will come to the kitchen to smoke and will have his face blown off.