A Temple Hills man was killed yesterday morning when his 16-year-old stepdaughter hit him several times with a blunt instrument and stabbed him with a knife after he threatened the girl's mother, Prince George's County police said.

Police said the girl went to help her mother after the woman's husband threatened her. The girl struck her stepfather several times in the head with a blunt instrument, and then stabbed him in the back with a knife, police said.

The 37-year-old man was pronounced dead at the family's home by the medical examiner. The name of the girl was being withheld pending review by the state's attorney's office. No charges have been filed.

In another incident in southern Prince George's County, a gas station owner died after he received gunshot wounds as he attempted to make a night bank deposit, police said.

It was midnight when Marcellus Akins Bowie, 59, of 5401 Old Temple Hills Rd., Temple Hills, closed his Texaco station at Rte. 210 and Livingston Road in Fort Washington, according to police. He counted the day's receipts, bundled them up and drove to the United Bank at 9401 Livingston Rd., police said.

As he walked from his car to the bank's night deposit slot, he was robbed and shot several times, police said. Before lapsing into unconsciousness, Bowie told police the gunman was wearing a ski mask. Bowie was pronounced dead on arrival at Greater Southeast Community Hospital at 1:30 a.m. Police said they have no suspects.

The two killings -- and the slayings of five persons in a Landover apartment complex Friday night -- bring the total of homicides in the county to 14 in the first 23 days of 1988. There were a record 96 homicides in the county in 1987.