A fugitive gunman who fled the country after killing a Brooklyn teen more than three years ago has been hauled back to the U.S. from Trinidad and Tobago to face justice, prosecutors said Monday. Anthony Regis-Ash went on the run after shooting 18-year-old Sharif Richards as the teen sat in an Infiniti in Canarsie, leaving his girlfriend behind to face murder charges in the Sept. 29, 2021, slaying, prosecutors in Brooklyn said. Regis-Ash, 24, was arrested in the Cunupia area of Trinidad on Oct. 9, a few months after U.S authorities asked officials in the dual-island Caribbean nation for help extraditing him. He was formally extradited on Dec. 22, and indicted on murder and other charges Monday. Richards was sitting in the driver’s seat of the Infiniti, near Foster Ave. and E. 80th St. in Canarsie when he was shot. The 2020 Erasmus High School graduate had been expected to begin an electrical engineering program in the fall, family members told the Daily News. Sharif RichardsObtained by Daily NewsSharif Richards Police arrested Regis-Ash’s alleged accomplice Amari Harvey, 21, in January 2022, grabbing her at Kennedy Airport right before she boarded a flight to Trinidad and Tobago. After her arrest, she laid the blame on her boyfriend and said she was selling Richards pot when the gunman pulled the trigger, according to a criminal complaint. Video from the scene shows Harvey get out of Regis-Ash’s 2015 Nissan on E. 78th St., between Farragut and Glenwood Roads, then walk down the block to meet Richards, according to prosecutors. Harvey can be seen getting into Richards’ car, and a minute later, Regis-Ash, sporting a hoodie and a mask, leans into the vehicle in an attempt to rob the teen, prosecutors said. Investigators also have text messages between Richards and both suspects, prosecutors said. “The brutal ambush and murder of 18-year-old Sharif Richards in Canarsie was a heinous act of violence that shattered a young life and devastated a family,” Brooklyn District Attorney Eric Gonzalez said Monday. “By extraditing the alleged perpetrator from Trinidad and Tobago, we reaffirm our unwavering commitment to ensuring that this kind of callous disregard for human life is met with the full force of justice.” Regis-Ash was arraigned in Brooklyn Supreme Court, where Justice Donald Leo ordered him held without bail. He faces the possibility of 25 years to life behind bars if convicted. A lawyer for Regis-Ash declined comment. Harvey, who still faces murder and other charges, remains held on $1 million cash bail or $2 million bond.