A 67-year-old taxi driver was shot to death in his cab by a woman Saturday evening, D.C. police reported.

Police said the victim, identified as John Worthy, of 659 Shepherd St. NW, was shot at the corner of 9th and M Streets NW about 6:20 p.m.

Police said they have arrested Mary Gillespie, 39, of 1123 9th St. NW.

In another incident, police reported a serious shooting about 2 a.m. Sunday at 9th and L Streets NW. No further details were available last night.

The two altercations took place within three blocks of the scene of two fatal shootings during July. Those two incidents took place at the corner of 8th and N Sts. NW.

D.C. police, who say the area is a center for prostitution and drugs, last week made two arrests in the earlier cases. D.C. Police said they arrested a juvenile on Saturday in connection with the slaying of Alfonso Chrisholm, 63, last Tuesday.

Earlier, D.C. police had announced the arrest of Leon David Morton and charged him in the homicide in connection with the fatal shooting July 1 of Ronnie Lee Ferguson, 24, a Buffalo, N.Y., man who was visiting Washington.