When a transgender woman was attacked in a Dallas parking lot in April, cellphone camera footage of the episode made national headlines, and the police investigated it as a possible hate crime.

A month later, on Sunday, the Dallas Police Department announced that the woman, Muhlaysia Booker, 23, had been shot and killed. The police said it had no evidence linking the killing to the earlier attack.

At a news conference, Maj. Vincent Weddington said that officers found Ms. Booker shortly before 7 a.m. on Saturday, and that her identity was confirmed on Sunday. They had been responding to a report of a shooting and found Ms. Booker “lying facedown in the street, deceased from homicidal violence,” he said.

Major Weddington added that Edward Thomas, the man who was arrested after he was filmed repeatedly punching Ms. Booker last month, was no longer in police custody, but that there was no indication he was linked to the killing.