A southwestern Missouri man has been charged with four counts of murder in the killing of three people, including a pregnant woman and her fetus.

Twenty-five-year-old Brian Williams of Sparta appeared in court Tuesday and was jailed without bond on four counts of first-degree murder and armed criminal action.

Investigators allege in a probable cause statement that Williams shot 27-year-old James Marsh; Marsh's pregnant girlfriend, 26-year-old Casey Maples; and 40-year-old Christina Winden at a mobile home in Ozark, Missouri. Williams also is accused of killing Maples' unborn child that a pathologist says was 7 or 8 weeks old.

Authorities haven't revealed a motive. The probable-cause statement says Williams told investigators he had no remorse about killing Maples.

Court records don't list an attorney for Williams to comment on the charges.