The daughter-in-law of former State Senator Don Perata drowned in her family swimming pool in Napa over the weekend. Napa Police say 38-year-old Catherine Perata was found unresponsive Saturday by her husband in their backyard pool. An autopsy yesterday determined that the cause of death was drowning. Police say foul play is not suspected, but they're waiting for a toxicology report before concluding the investigation.