The Latest: Group wants independent inquiry in witness death

DALLAS (AP) — The Latest on the death of a witness who testified at the trial of a Dallas police officer who fatally shot her neighbor (all times local):

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2:15 p.m.

The NAACP Legal Defense and Educational Fund Inc. is requesting an independent investigation into the fatal shooting of a key witness in a Dallas police officer's murder trial days after the officer's conviction.

In a statement Sunday, the LDF called the killing Friday of Joshua Brown "deeply alarming and highly suspicious." Sherrilyn Ifill, the group's president, said the circumstances surrounding Brown's death "cries out for answers."

Meanwhile, Dallas Mayor Eric Johnson is urging people to avoid speculation about Brown's death. He says he believes the police will conduct a thorough investigation.

Amber Guyger was convicted last week of murder in the death of her upstairs neighbor, Botham Jean, whose apartment she said she mistook for her own.

Brown testified that on the night of the killing, he heard what sounded like "two people meeting by surprise" and then two gunshots.

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8:50 a.m.

The mayor of Dallas is urging people to avoid speculation after a key witness in a Dallas police officer's murder trial was shot to death days after the officer's conviction.

Dallas Mayor Eric Johnson said on Twitter that he trusts Dallas police will conduct a thorough investigation into the death of Joshua Brown and that until then, people should "refrain from speculation."

Dallas Police Chief U. Renee Hall said Sunday that police have no suspects or motives in the Friday killing of Brown, who had lived in the same apartment complex as Dallas police officer Amber Guyger and Botham Jean.

A jury convicted Guyger of murder last week for fatally shooting Jean inside his own apartment. Police say the shooting that killed Brown happened at another apartment complex.