Ex-NFL wide receiver Travis Rudolph has been arrested for murder ... after the 25-year-old allegedly gunned down a man in Florida.
TMZ Sports has confirmed ... cops say they responded to a double shooting in West Palm Beach shortly after midnight on Wednesday -- where they say one man was found dead upon arrival, while the other man had already been taken to a nearby hospital.
Cops say they were able to identify Rudolph as the main suspect ... and arrested and transported him to county jail on first-degree murder and attempted first-degree murder charges.