Stephen Paddock, who killed at least 58 people and wounded hundreds more in Las Vegas on Sunday with high-powered rifles, was prescribed an anti-anxiety drug in June that can lead to aggressive behavior, the Las Vegas Review-Journal has learned. Records from the Nevada Prescription Monitoring Program obtained Tuesday show Paddock was prescribed 50 10-milligram diazepam tablets by Henderson physician Dr. Steven Winkler on June 21. Diazepam is a sedative-hypnotic drug in the class of drugs known as benzodiazepines, which studies have shown can trigger aggressive behavior “If somebody has an underlying aggression problem and you sedate them with that drug, they can become aggressive,” said Dr. Mel Pohl, chief medical officer of the Las Vegas Recovery Center.