After about two hours of closing arguments, it took a Dallas County jury less than 30 minutes to decide Billy Chemirmir's fate on Friday.
The jury found the 49-year-old guilty of capital murder in the 2018 death of Mary Brooks, 87.
With the prosecution not seeking the death penalty, Chemirmir was automatically sentenced to life in prison without the possibility of parole.
"We are so thrilled that this defendant will never be able to hurt any other family again," Brooks' sister Ann Brooks told reporters outside the courtroom after the verdict was read.
Brooks was one of 22 women Chemirmir was suspected of killing in a two-year span from 2016 to 2018.
He was previously convicted of killing Lu Harris, 81, and was sentenced to life in prison without parole in that case.
Dallas County District Attorney John Creuzot said his objective was to get two capital murder convictions against Chemirmir, just in case one of them ends up being overturned on appeal.
"We never know if a case will be reversed on appeal just like Mr. Halprin's case 20 something years later," said Creuzot, referring to the case of Texas Seven convict Randy Halprin, who a Dallas County judge has recommended get a new trial in connection with the shooting death of Irving police officer Aubrey Hawkins.
Creuzot said two life prison sentences without the possibility of parole is just as effective as a death sentence.
"He in effect has a death sentence," Creuzot said outside the courtroom Friday. "He's going to die in the penitentiary."
Ann Brooks said the verdict gives the family justice and closure.
"Our beloved mother, Mary Sue -- her life is over and her jewelry is gone, but her love and her memories will live in us forever."
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