The daughter of a murder victim speaks about how her mother's death was initially thought to have been a heart attack or a stroke before it was later deemed murder.

Billy Chemirmir smothered and murdered many women, including this victim, between 2016 and 2018, stealing their jewelry and valuables in the process.

This is an image of one of the older women killed as part of the Pillowcase Murders crime spree committed by Billy Chemirmir between 2016 and 2018.

The pictured jewelry belonged to one a victim killed at the hands of convicted murderer Billy Chemirmir during the string of killings known as the Pillowcase Murders.

A sheet illustrates the perfectly straight positions in which many of Billy Chemirmir's murder victims were found, which was one thing linking the murders.

A police officer discusses the heinous nature of the murders committed by Billy Chemirmir in Texas, which took the lives of more than 20 elderly women and one man.

This is a promo image for The Pillowcase Murders, which chronicles killings committed by Billy Chemirmir between 2016 and 2018, during which older women were victimized.

Individuals echo each other as they explain that many of Billy Chemirmir's victims were assumed to have died of natural causes, allowing his killing spree to continue.

Victims' family members discuss the similarities between each of the Pillowcase Murders, a string of killings committed by Billy Chemirmir between 2016 and 2018.

This is an image of Billy Chemirmir, the serial killer suspected of killing up to 24 women and attempting to kill at least two others in Texas between 2016 and 2018.