The Latest: Prosecutor: Teen shot girl after argument

A prosecutor in South Dakota alleges a 17-year-old boy charged with killing a girl whose her body was found in his basement shot the girl after an argument

The Latest on the arrest of a teen in death of girl found in his basement in South Dakota (all times local):

3:55 p.m.

A South Dakota prosecutor alleges that a 17-year-old boy charged with killing a girl whose body was found in his basement shot the girl after an argument.

The teen is charged as an adult with second-degree murder, which carries a mandatory life sentence upon conviction. The Rapid City Journal reports that he made his initial court appearance Wednesday and will remain in juvenile detention with bond set at $1 million.

The teen is charged with killing the girl, who authorities believe is 16-year-old Shayna Ritthaler, of Moorcroft, Wyoming. She has been missing since last Thursday. Deputies found the girl's body on Monday.

Acting Meade County state's attorney Michele Bordewyk said in court that the defendant was with the victim when an argument turned violent and "he shot her."

The defendant's attorney, Steven Titus, told The Associated Press that he will ask for the case to be returned to juvenile court and that the teen will plead not guilty at his next court appearance on Oct. 17.

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10:40 a.m.

A prosecutor in South Dakota says she plans to file adult charges against a 17-year-old boy who was arrested after a girl's body was found in his basement.

Meade County sheriff's officials believe the victim is 16-year-old Shayna Ritthaler, from Moorcroft, Wyoming, who has been missing since Oct. 3.

Acting Meade County state's attorney Michele Bordewyk tells the Rapid City Journal that the teenager is expected to make an initial court appearance Wednesday. She did not say what charges he will face.

Deputies found the girl's body at the Sturgis area home on Monday. Bordewyk tells the Rapid City Journal that the boy lived there with his mother.

Authorities haven't disclosed how the girl died. An autopsy is planned for this week.

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9:24 a.m.

A 17-year-old boy has been arrested after a girl, believed to be missing from Wyoming, was found dead in his basement in South Dakota.

The Meade County Sheriff's Office says the victim is apparently 16-year-old Shayna Ritthaler, from Moorcroft, Wyoming, who has been missing since Oct. 3.

The body was found Monday at the boy's home near Sturgis after deputies and agents from the South Dakota Division of Criminal Investigation searched the house at the request of the Lawrence County Sheriff's Office, which is working with Moorcroft police.

Meade County Sheriff Ron Merwin has not disclosed the cause of death and isn't sure if the suspect and victim knew each other. An autopsy is scheduled later this week.

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Information from: Rapid City Journal, http://www.rapidcityjournal.com