Reuters/Shannon StapletonFlorida cops says they’re probing what led a 32-year-old man to fatally stab his parents before flooding their home and killing himself in a bathtub. The grisly scene was discovered Monday night in Wesley Chapel, a Tampa suburb, where concerned neighbors called in a welfare check after spotting water suspiciously pouring out of the home’s garage and front door all weekend. Inside, officers found a 70-year-old man and 63-year-old woman dead in the living room from days-ol