(WPXI) – Six people are now dead after an explosion on Rustic Ridge Drive in Plum Borough that destroyed three homes and damaged at least a dozen more. Heather Oravitz, 51, community development director for the borough, lived in the house that exploded and was killed, the Plum Borough mayor confirms. Her husband, Paul Oravitz, was in the hospital in critical condition but later died from his injuries. Two people who were taken to the hospital in stable condition and have since been released and fifty-seven firefighters were treated at the scene due to “minor issues.” The cause of the explosion is still under investigation.