Makiyah Wilson, 10, was shot and killed in July as she clutched a $5 bill for an ice cream truck in Northeast Washington. (Family photo courtesy of Raven Hall)

D.C. police arrested a seventh suspect Friday in the shooting of 10-year-old Makiyah Wilson, who was killed outside her home in July when masked gunmen fired more than 70 bullets into a crowded courtyard.

Darrise Jeffers, 19, of Northwest Washington, was charged with first-degree murder while armed. He could make an initial appearance in D.C. Superior Court on Saturday.

Police said in court documents filed for other suspects that Jeffers helped defendants in the July 16 shooting, which authorities have said was prompted by a neighborhood dispute between Wellington Park and Clay Terrace, where Makiyah lived.

Jeffers, a court affidavit says, conspired by “purchasing, storing and holding firearms in preparation for the shooting and moving the firearms after the shootings.”

Makiyah was shot as she clutched a $5 bill for an ice cream truck in front of her apartment in the 300 block of 53rd Street NE.

Among the six others police have arrested in the killing is a 16-year-old charged as an adult with first-degree murder.

Police have identified one suspect as the alleged driver of the vehicle used during the shooting, and another as the alleged planner. Police said four masked gunmen opened fire. A woman who police say knew several of the suspects has been charged with obstruction of justice.