The sudden death of Beverly Hills, 90210 star David Gail is being investigated as a possible overdose, RadarOnline.com has learned. News of the beloved soap opera star’s sudden passing broke over the weekend. He was 58 years old. According to TMZ, law enforcement confirmed that the investigation into Gail’s death is ongoing, but said they’re looking into the possibility of a fatal drug overdose. Law enforcement noted that no foul play is suspected but said they’re awaiting toxicology reports to determine a cause of death, further pointing to a potential overdose. Potential substances that may …