A 14-year-old female Philadelphia teenager has become the second to face a murder charge after a 73-year-old man was beaten to death with a traffic cone. 

The girl, identified by the Philadelphia Police Department as Gamara Mosley, was charged with third-degree murder and criminal conspiracy in the June 24 killing of James Lambert

Another 14-year-old teenager, Richard Jones, already faces the same charges after being arrested Monday, police added. Both are being charged as adults.

Police say Mosley turned herself in to investigators on Wednesday. 

PHILADELPHIA TEENS BEAT MAN TO DEATH WITH TRAFFIC CONE IN ATTACK CAUGHT ON VIDEO, POLICE SAY 

Philadelphia James Lambert attack June 24

James Lambert, 73, died after being struck with a traffic cone by a group of Philadelphia teenagers, police say. (Philadelphia Police Department)

Police allege Mosley was seen on surveillance footage hitting Lambert twice with a traffic cone and possibly another time off-camera, Fox29 Philadelphia reports. 

"My client is 14 years of age, I would ask that everyone hold judgment," her attorney, Lonny Fish, told the station. 

James Lambert teen suspect faces murder charge

Gamara Mosley, 14, is being charged as an adult in the killing of James Lambert, police say. (Philadelphia Police Department)

A 12-year-old girl who turned herself in alongside Mosley was released without being charged, the station also reported. 

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James Lambert killed in Philadelphia

James Lambert, 73, was murdered by a group of teens in Philadelphia on June 24, according to police. (Fox29 Philadelphia)

"She took a stand in that moment, and in fact, tried to push people away," that girl’s attorney, Donte Mills, told Fox29 Philadelphia. "She tried to stop them from attacking Mr. Lambert." 

The motive for the killing remains unclear.