A Texas judge declared a mistrial Friday in the first murder case against a man charged with killing 18 older women in the Dallas area over a two-year span, but prosecutors vowed to continue to pursue convictions.

Judge Raquel Jones issued the ruling when a jury deadlocked after deliberating since Thursday afternoon in the capital murder case charging Billy Chemirmir with killing 81-year-old Lu Thi Harris.

Dallas County District Attorney John Creuzot said he was resolved to retry the case and bring another one against the 48-year-old defendant. "Our commitment was to get two convictions and that does not change," Creuzot told The Dallas Morning News.

Defendant Billy Chemirmir listens to motions and language being discussed and sent to the jury after one juror is hanging up the deliberations in his capital murder trial at the Frank Crowley Courts Building in Dallas, Friday, Nov. 19, 2021. Chemirmir, 48, faces life in prison without parole if convicted of capital murder for smothering Lu Thi Harris, 81, and stealing her jewelry. He is accused of killing at least 18 women in Dallas and Collin counties. (Tom Fox/The Dallas Morning News via AP, Pool)

Defendant Billy Chemirmir listens to motions and language being discussed and sent to the jury after one juror is hanging up the deliberations in his capital murder trial at the Frank Crowley Courts Building in Dallas, Friday, Nov. 19, 2021. Chemirmir, 48, faces life in prison without parole if convicted of capital murder for smothering Lu Thi Harris, 81, and stealing her jewelry. He is accused of killing at least 18 women in Dallas and Collin counties. (Tom Fox/The Dallas Morning News via AP, Pool) (Tom Fox/The Dallas Morning News via AP, Pool)

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In a series of notes to the court Friday, the 12 jurors said they were "hopelessly deadlocked 11 to one" in the case. It was not clear what verdict the majority of jurors supported. Jones initially resisted declaring a mistrial, repeatedly ordering the jury to continue deliberating.

After the mistrial decision, relatives of the women Chemirmir is accused of killing spoke outside the courtroom, which they'd been prohibited from entering during the trial as a COVID-19 precaution

"We are devastated at the outcome of this trial," said Loren Adair-Smith, the daughter of Phyllis Payne. "We are sickened that we have to come back and hear the same evidence again."

Chemirmir’s attorneys rested their case without calling any witnesses or presenting evidence, and he didn’t testify. They dismissed the evidence against their client as "quantity over quality" and asserted that prosecutors had not proved Chemirmir’s guilt beyond a reasonable doubt.

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Following the mistrial, defense attorney Kobby Warren said his client maintains his innocence and disputed the idea of the trial being derailed by a "rogue juror."

"It was all circumstantial," he said of the case against Chemirmir.

Chemirmir was arrested in March 2018 after 91-year-old Mary Annis Bartel said a man forced his way into her apartment at an independent living community for seniors in the Dallas suburb of Plano.

When police tracked Chemirmir to his nearby apartment following the attack on Bartel, he was holding jewelry and cash. Documents in a large red jewelry box police say he had just thrown away led them to a Dallas home, where Harris was dead in her bedroom, lipstick smeared on her pillow.

After his arrest, authorities announced they’d begin reviewing hundreds of deaths, signaling the possibility that a serial killer had been stalking older people. Over the following years, the number of people Chemirmir was accused of killing grew.

Defense attorney Kobby Warren, standing, right, listens to attorney Mark Watson, top left, as his client Billy Chemirmir, seated right, waits for motions and language being sent to the jury in his capital murder trial at the Frank Crowley Courts Building in Dallas, Friday, Nov. 19, 2021. He was joined by private investigator Tonia Silva seated, left. Chemirmir, 48, faces life in prison without parole if convicted of capital murder for smothering Lu Thi Harris, 81, and stealing her jewelry. He is accused of killing at least 18 women in Dallas and Collin counties. (Tom Fox/The Dallas Morning News via AP, Pool)

Defense attorney Kobby Warren, standing, right, listens to attorney Mark Watson, top left, as his client Billy Chemirmir, seated right, waits for motions and language being sent to the jury in his capital murder trial at the Frank Crowley Courts Building in Dallas, Friday, Nov. 19, 2021. He was joined by private investigator Tonia Silva seated, left. Chemirmir, 48, faces life in prison without parole if convicted of capital murder for smothering Lu Thi Harris, 81, and stealing her jewelry. He is accused of killing at least 18 women in Dallas and Collin counties. (Tom Fox/The Dallas Morning News via AP, Pool) (Tom Fox/The Dallas Morning News via AP, Pool)

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For the families of most of the women he’s been charged with killing, they learned months or years after their loved one’s death that authorities believed they’d been killed. Those families had puzzled over the suddenness of their older but otherwise healthy and active loved ones’ deaths, and in many cases, filed police reports when jewelry was found missing after their deaths.

Bartel died in 2020 but jurors heard from her during the trial through a taped deposition. She said she did not remember details of the appearance of the man who attacked her but said she knew she was in mortal danger the minute she opened her door.

"My eyes were just fixated on these green rubber gloves that I saw. I knew instantly when I saw those two green rubber gloves, number one, I should not have opened the door, number two, my life was in grave danger," Bartel said on the video.

She said that she tried to push the door shut but was overpowered. "He said: ‘Don’t fight me, lie on the bed,’" Bartel said.

Defense attorney Kobby Warren, center, asks Judge Raquel "Rocky" Jones, right, about the motions and language being sent to the jury after one juror is hanging up the deliberations in the capital murder trial of Billy Chemirmir, left at the Frank Crowley Courts Building in Dallas, Friday, Nov. 19, 2021. Chemirmir, 48, faces life in prison without parole if convicted of capital murder for smothering Lu Thi Harris, 81, and stealing her jewelry. He is accused of killing at least 18 women in Dallas and Collin counties. (Tom Fox/The Dallas Morning News via AP, Pool)

Defense attorney Kobby Warren, center, asks Judge Raquel "Rocky" Jones, right, about the motions and language being sent to the jury after one juror is hanging up the deliberations in the capital murder trial of Billy Chemirmir, left at the Frank Crowley Courts Building in Dallas, Friday, Nov. 19, 2021. Chemirmir, 48, faces life in prison without parole if convicted of capital murder for smothering Lu Thi Harris, 81, and stealing her jewelry. He is accused of killing at least 18 women in Dallas and Collin counties. (Tom Fox/The Dallas Morning News via AP, Pool) (Tom Fox/The Dallas Morning News via AP, Pool)

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Bartel described a pillow being smashed into her face and her attacker "using all his weight to keep me from breathing." Chemirmir was charged with attempted capital murder in the attack on Bartel.

Jurors saw surveillance video from a Walmart showing that Harris and Chemirmir were at the store at the same time, just hours before she was found dead.

Most of the victims were killed at independent living communities for older people, where Chemirmir allegedly forced his way into apartments or posed as a handyman.

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Harris’ son-in-law, Richard Rinehart, testified that the jewelry and jewelry box found in the trash when Chemirmir was arrested belonged to his mother-in-law.

Evidence presented showed that Chemirmir also had numerous $2 bills at the time. Rinehart testified that his mother-in-law loved giving them as gifts. Police also said Chemirmir was arrested with a set of keys that opened the front doors of Harris’ home.

Jurors also heard about the killing of of 87-year-old Mary Brooks, who was found dead in her Richardson home in January 2018. Hers was one of the 18 slayings Chemirmir has been charged with.

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Prosecutor Glen Fitzmartin said that Brooks’ death had originally been called a natural death, but after an investigation following the arrest of Chemirmir, the medical examiner changed the cause of death to homicide.

Fitzmartin said that Chemirmir also followed Brooks home from the same Walmart Harris was at before her death. Her daughter, Ann Brooks, testified that after her mother’s death, her mother’s safe was missing, as was most of her jewelry, including wedding rings and a coral necklace she always wore.

Chemirmir, who immigrated to the U.S. from Kenya, became a permanent U.S. resident in 2007.