"Storm Chasers" star Joel Taylor died from an ecstasy overdose while on a cruise ship earlier this year ... according to his toxicology results.
The Bureau of Forensic Sciences of Puerto Rico tells us, based on Taylor's lab results, it was determined his cause of death was MDMA poisoning.
TMZ broke the story -- Taylor was found unresponsive in his room back in January -- witnesses told us he was seen earlier in the night being carried off the dance floor by two other men. We were told he'd consumed multiple substances.
The cruise Taylor was on was full of celebs, with performances from Olivia Newton-Johnand Galantis.
Several people had been arrested prior to boarding the ship in Ft. Lauderdale for drug possession.
Taylor was 38 years old.