The ritzy celebrity-riddled neighborhood of Malibu, CA, has been left shaken after a security guard was found dead at a favorite local spot. According to the Los Angeles County Sheriff’s Department, the 58-year-old man’s body was discovered in a pool of blood Tuesday morning in the parking lot of the Trancas Canyon Nursery, a hotspot for A-listers. An investigation has been launched into the man’s “suspicious” death after it was revealed he suffered blunt force trauma to the head and upper torso. “They examined the victim. He appeared to sustain some sort of blunt force trauma to the upper tor…