U.S. Marshals are looking for the last defendant in a massive heroin trafficking ring that operated in and around the District of Columbia.

Nearly three dozen people were indicted in November and arrested as part of a sprawling drug operation that represented one of the largest enforcement efforts in years aimed at D.C. drug dealers.

Authorities say 37-year-old Jean Levi Baptiste helped run an operation in the Kenilworth Gardens area, where undercover detectives bought nearly $10,000 worth of heroin in quantities ranging from 5 grams to nearly an ounce.

U.S. Marshals have classified this as a major case because Baptiste was an alleged leader of this drug organization, said Supervisory Inspector Matt Burke.

"He's the last remaining participant in this offense, and we'd like the public's help on closing the book on this case," Burke said.

Baptiste is wanted out of federal court in D.C. for conspiracy to distribute heroin.

Baptiste has an history of arrests in the District and Maryland on charges of assault, armed robbery, weapons violations and distribution of narcotics, marshals' deputies say.

He is listed as 6 feet tall, 200 pounds with tattoos on both arms and a crippled finger on his right hand.

Investigators believe he is still in the area and is known to hang out on the 3600 block of Minnesota Avenue NE, and the 9700 block of Ninth Street SE.

Anyone with information should contact the Capital Area Regional Task Force at 301-489-1717.

Since 2008, The Washington Examiner's "Most Wanted" feature has led directly to the capture or surrender of murderers, armed robbers, kidnappers, sex offenders and drug dealers.

At least nine of the fugitives were wanted for a killing or had previously been convicted of a homicide.