D.C. police have arrested two additional suspects in the March shooting death of a Dupont Circle shoe store worker during a robbery outside his Northeast Washington apartment, officials said Tuesday night.

Floyd Neal, 20, and Lafeyette Robinson, 19, both of Northeast, were each charged with first-degree murder while armed. Both defendants were ordered detained until their preliminary hearings in D.C. Superior Court, scheduled for June 25 and June 27, respectively.

Earlier this month, police arrested Deandre Shaheed, 18, of Northeast Washington and charged him with first-degree murder while armed. He also has been ordered detained and has a preliminary hearing scheduled for June 27.

They are charged with killing Akinwole Olu Williams, 31, of Northeast, on March 14. Police said Williams was accosted as he was about to enter his apartment in the 1000 block of 44th Street about 11:40 p.m.

He had just walked home from the Deanwood Metro after having worked his shift at Comfort One Shoes. His brother worked at a store across the street.

Williams graduated in December from Catholic University — after 14 years, on and off — with a bachelor’s degree in interdisciplinary studies. He was also taking graduate-level courses with an eye toward law school.

Police said that he had tried to thwart the robbery when he was shot.