Jamie Jenkins had just finished singing with her R&B band when she called her younger brother about 3 a.m. Saturday to say someone had snatched her purse, family said. He quickly left to help her.

It’s not clear what happened next, but about an hour later, the two were slain on East Capitol Street. Police said the pair were found lying on a sidewalk. Jamahl Jenkins, 21, died at the scene, and Jamie Jenkins, 28, died later at a hospital, they said.

Their deaths came at the end of a series of overnight shootings that left three people dead and three others injured in the District, police said.

On Saturday afternoon, friends and relatives of the siblings gathered outside the Southeast Washington apartment building where they lived. They said Jamahl Jenkins worked at a restaurant and had become the father of a son a few months ago. His sister, they said, had wanted to become a singer since she was a child and saw her job with the local band Raw Sounds as a stepping stone to fame.

“She said if she ever made it big, she was going to buy her mother a nice house. She was a nice girl,” said Wayne Jones, an uncle. “Jamahl was a good person, too. He was out there trying to help his sister.”

Not long before the two Jenkinses were slain, a man was shot and killed in Northwest, police said. About 4:10 a.m., police found the man, who was suffering from gunshot wounds, in the 1100 block of First Place NW, authorities said. They did not immediately identify him.

Police also were investigating two nonfatal overnight shootings. At 11:15 p.m. Friday, an Oxon Hill man was shot in the back in Southwest, police said. And just after midnight, two men were shot in the legs on Birney Place SE. They are expected to survive, police said.

No arrests have been made in any of the cases. Officer Araz Alali, a police spokesman, said investigators don’t think there is a connection between them.

Family members said Jamie Jenkins had finished a Friday night performance when she called about the theft, saying someone had grabbed her bag as she got out of a car. They said that they did not know whether the shooting was linked to the purse-snatching and that they think the brother and sister were walking to a friend’s house nearby when they were killed.

“It is just sad to see young people get killed,” said Garland Gee, another uncle. “It’s kind of tough to take.”

Police would not comment on the relatives’ accounts or provide additional details.

“It is an ongoing investigation,” Alali said. “I have not motive at this time.”

The overnight incidents followed other multiple shootings in the past week.

A shooting Wednesday night left two men dead and a third wounded outside a strip of rowhouses in Southeast.

A day earlier, three people were shot and wounded in the 2400 block of Elvans Road SE, about three blocks from where four people were shot last weekend in the 2600 block of Stanton Road SE. The victims in the weekend incident, including two teenagers, suffered minor injuries, police said.

Saturday’s shootings brought to 51 the number of people killed in the District this year.