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[Read our live briefing for the latest updates on the Dayton and El Paso shootings]

Mr. Betts often expressed concerns to her about having dark thoughts, she said.

“I remember specifically him talking about being scared of the thoughts that he had, being scared that he had violent thoughts,” said Ms. Carpenter, who cut off contact with him in 2013 after he lashed out at her during an online chat. “He knew it wasn’t normal.”

The police in Dayton were quick to caution on Monday that much about the shooting early Sunday morning was still unknown. There was still no clear motive, nor an understanding of how three people — Mr. Betts, his sister and a mutual friend — all went out together and one ended up shooting the other two. The friend, who has not been named by the police, was shot in his lower torso but survived; the sister, Megan Betts, 22, was killed.

“It seems to just defy believability that he would shoot his own sister,” said Dayton’s police chief, Richard Biehl, at a news briefing on Monday morning. “But it’s also hard to believe he didn’t recognize that was his sister, so we just don’t know.”

[Those who died left behind at least eight children, and countless friends, co-workers, classmates and family members. Here is what we have learned about each of the victims.]