A 17-year-old District youth who escaped three times this year from the city's Oak Hill detention center for juveniles was charged yesterday with a third count of first-degree murder, D.C. police said.

Carl S. Richardson, who previously was charged with first-degree murder in two Prince George's County slayings, was named in a D.C. Superior Court arrest warrant charging him in the Oct. 7 killing of Michael Gray Goodwin, 32, of 31176 Temple Hills Rd, Temple Hills. Goodwin was found shot to death in a car in the 1000 block of Varney Street SE, police said.

Another slaying in which Richardson is accused also occurred Oct. 7, less than two weeks after Richardson's latest escape from the maximum-security Oak Hill center, authorities said. Richardson, who has been charged with murder and assault in two August incidents, is being held without bond at the Prince George's jail. Police said the assault charge stemmed from a shooting during an Aug. 14 motel robbery.

The youth escaped from Oak Hill in February, June and last month, authorities said. The facility has been troubled by reports of more than 160 escapes in the last year.