Prince George's County police have recovered a .45-caliber pistol they believe was used to kill an 18-year-old high school student as she waited for her father outside a Chinese restaurant in Chillum, law enforcement sources said yesterday.

Zheng Xianjuan, a senior at Northwestern High, was eating a bowl of soup as she waited for her father to finish his shift as a cook at Sunflowers Carry Out on Monday night when two men approached and shot her several times in the head.

Police recovered the handgun near the crime scene, a strip mall in the 5600 block of Sargent Road, according to several investigators who did not want to be identified because the case is open.

They said bullet casings found near Zheng's body match the weapon they found. Detectives also discovered a T-shirt next to the gun.

Police say they still do not have any suspects or motive in the case. They are investigating whether the killing was a botched robbery.

The teenager's father, Zheng Xinbin, 50, heard shots and ran outside to find his daughter lying on the ground next to a mailbox. When he saw her, he collapsed next to her, witnesses said.

She was his only daughter, an A student who came to this country when she was 16. She planned to attend college next year.

Detectives are also investigating another homicide that occurred about 5 a.m. yesterday in the Temple Hills neighborhood.

Officers discovered Steven Bernard Mann, 21, in the 2400 block of Dawson Street. Police said it appeared he was killed in another location and left there. Mann, of the 2800 block of Sydney Avenue, had been shot multiple times.