Harmony Richardson, 8, left, and Tenika Fontanelle join in a candlelight vigil for missing 8-year-old Relisha Rudd on March 31, 2014. Fontanelle was fatally shot during an altercation in her home in Southeast Washington on Aug. 18, 2015. (Amanda Voisard/For The Washington Post)

The 17-year-old charged in Tuesday’s fatal shooting of a Southeast Washington mother told authorities that he believed the woman accidentally shot herself as he, the woman and the woman’s 12-year-old son fought inside her apartment, charging documents filed in D.C. Superior Court show.

The teenager, Kevin Lee, of the 1300 block of Congress Street SE, was charged as an adult with second-degree murder in the shooting of Tenika Fontanelle, 31. But according to the documents, Fontanelle’s 12-year-old son told detectives that Lee shot his mother twice after Lee stormed into their apartment with a .25-caliber handgun.

The wildly different accounts came as Lee, who also was shot during the altercation, made his first court appearance Thursday after being discharged from a local hospital. Magistrate Judge Renee Raymond ordered that Lee remain jailed until his next hearing, set for Sept. 2, when a determination will be made as to whether he is released or held until trial.

In interviews with homicide detectives in the hours after the shooting, nine witnesses recalled a seemingly innocent start to the altercation on Savannah Street in Congress Heights, court documents show. But only Lee, Fontanelle and her son were in the apartment at the time of the shooting.

Fontanelle’s son, who is not being named because he is a minor and witness to a crime, told detectives that he, Lee and several other youths were in the neighborhood when several of the boys in the group began teasing Lee and throwing rocks and sticks at him and several of the others in the group. According to the 12-year-old, Lee then warned them to stop or they were going to “make him do something to them,” according to the charging documents.

Fontanelle’s son said Lee made a shooting gesture with his hand and pulled a silver gun with a black handle from his waistband, the documents show. Fontanelle’s son said he and his friends ran away, with the 12-year-old heading for home.

Shortly after Fontanelle’s son arrived at his apartment, the documents show, Lee knocked on his apartment door. Fontanelle opened the door, and Lee burst in and began cursing at the mother and son, the 12-year-old told detectives. Lee and the boy began fighting, and Fontanelle jumped on Lee and put the teenager in a chokehold, the 12-year-old said in the charging documents. As the woman and teen wrestled, Fontanelle’s son told police, he hit Lee to get him off his mother.

Then, as Lee broke free from Fontanelle, her son told authorities, the teen stood up, pulled out the gun and shot the woman once in the groin. Fontanelle’s son said he heard his mother shout, “He shot me,” he told detectives, the documents show. The 12-year-old said he saw Lee point the gun at his mother a second time and shoot her once in the chest. The youth said that he tried to grab the gun from Lee but that the weapon went off and Lee accidentally shot himself in the chest. The gun went off again, the 12-year-old said, and he was shot once in one arm. Lee then ran from the apartment building, the 12-year-old said.

A medical examiner ruled that Fontanelle had died from a gunshot wound to the chest. The examiner’s report does not mention a second bullet wound on Fontanelle’s body.

Lee’s version of the events differs. In an interview with detectives, he said that the “little kids” were “messing” with him and his friends and that they were throwing rocks and bottles at him. Lee admitted to carrying the gun with him when he went to Fontanelle’s apartment to tell her about her son’s behavior. But Lee said that as he tried to tell Fontanelle about what happened, she became “aggressive and ignorant” and “sucker-punched” him.

Lee told police that Fontanelle and her son then jumped him. During the fight, Lee said, the gun went off and a bullet struck him in the chest and leg. Lee said he believed either Fontanelle or her son shot him, the court documents show. Lee said that he then heard another gunshot and that he believed she “may have shot herself.” Lee denied shooting Fontanelle.

Police said they found a .25-caliber semiautomatic pistol on the floor of Lee’s bedroom. The pistol had blood on the barrel, police said. Investigators said they also found ammunition in a pill bottle nearby, documents show. Under the mattress of Lee’s bed, police also found a 9mm assault rifle with one round of ammunition in the chamber and several rounds in the magazine, charging documents say.

Messages left at phone numbers listed for Lee’s family members were not returned Thursday.