Heat olive oil in a pan and sear venison chunks until browned on all sides (optional for extra flavor).
Transfer venison into crockpot.
Add potatoes, carrots, celery, onion, and garlic.
Stir in tomato paste, Worcestershire sauce, thyme, rosemary, and bay leaves.
Pour in beef broth until ingredients are covered.
Season with salt and pepper.
Cover and cook on Low for 8 hours (or High for 4 hours).
For thicker stew, stir in flour mixed with water 30 minutes before serving.
Remove bay leaves, adjust seasoning, and serve hot.