An immigrant healthcare worker has been indicted on two further counts of capital murder in North Texas after previously being charged with smothering almost a dozen elderly women to death.

A Dallas County Grand Jury on Tuesday indicted Billy Chemirmir, 47, on murder charges in the deaths of Leah Corken, 83, and Juanita Prudy, 82.

Billy Chemirmir (pictured), 47, who is suspected of being involved with more than 1,000 unexplained deaths in Texas, has been charged with 14 murders

The two women lived in The Tradition-Prestonwood in Dallas and died suddenly in the summer of 2016.

Court documents claim that Chemirmir smothered the women to death with a pillow.

Chemirmir is suspected of being involved with more than 1,000 unexplained deaths in Texas.

The Kenyan, who worked as a home healthcare aide, was initially charged in 2018 with the murder of 81-year-old Lu Thi Harris.

In May 2019, he was charged with 11 other murders by smothering and three counts of attempted murder.

As of Tuesday, Chemirmir had been indicted on 14 capital murder charges in total, all of which involved elderly people and many of whom lived in assisted living facilities.

He is believed to have posed as a maintenance worker to gain access to the buildings.

The death of 89-year-old Solomon Spring was the only one that did not involve smothering. He was found in a pool of his own blood inside his residence.

Leah Corken, 83, and Juanita Prudy, 82, were allegedly targeted by accused serial killer Billy Chemirmir

A timeline of deaths at The Tradition assisted living facility that are linked to suspected serial killer Billy Chemirmir. Several of the families have now filed a lawsuit against the facility

In Texas, a capital murder charge carries either the death penalty or life in prison without the chance of parole.

According to NBC, Chemirmir's attorney says his client maintains he is innocent of the charges.

He is being held in Dallas County Jail on $11.6 million bond.

U.S. Immigration and Customs Enforcement has also placed a hold on Chemirmir's file. This means that in the case that he is released from state custody, ICE can detain him and potentially begin deportation proceedings.

According to Dallas News, Chemirmir has permanent resident status and moved to the US in the 90s after his sister organized a visa for him.

Chemirmir was first arrested in March 2018 for allegedly smothering the first identified victim Lu Thi Harris with her pillow and stealing her jewelry box.

Police had been watching him in relation to another woman who he had allegedly tried to smother to death in the same fashion and robbed before fleeing.

Chemirmir who worked as a home healthcare aide, was initially charged in 2018 with the murder of 81-year-old Lu Thi Harris (left). In 2019, Chemirmir was indicted on six more murder charges, including the murder of Doris Gleason (right), 92, on October 29, 2016

Chemirmir was previously charged with the murder of Phyllis Payne (left), 91, on May 14, 2016, and Norma French (right), 85, who was killed October 8, 2016

At the time, officers observed Chemirmir putting something in a dumpster at his apartment block before executing an arrest warrant they had out on him in relation to the attempted capital murder.

Inside the dumpster, police found a box with jewelry inside, and a piece of paper they were able to link to a woman in Dallas.

They contacted local police to do a welfare check on Harris, and officers found her dead inside.

A general view showing Block 6600 of Warm Breeze Lane, where Dallas Police conducted a welfare check and found Harris murdered, allegedly smothered by Chemirmir

Chemirmir's initial attempted murder charge stemmed from an incident in Frisco in October 2017.

At that time, Chemirmir allegedly posed as a maintenance worker at the home of a 93-year-old woman living in assisted care in Frisco.

The woman told police she was smothered with a pillow, and robbed of jewelry.

Afraid for her life, the woman said she was praying out of fear she would die.

In March 2018, Chemirmir allegedly stormed into a 91-year-old woman's home and told her: 'go to bed, don't fight me'.

Timeline of Billy Chemirmir's victims May 14 2016: Allegedly murdered Phyllis Payne, 91, at Edgemere Senior Living June 5, 2016: Allegedly murdered Phoebe Perry, 94 July 31, 2016: Allegedly murdered Juanita Purdy, 83 at The Tradition August 19, 2016: Allegedly murdered Leah Corken, 83 at The Tradition October 2017: Attempted murder of a 93-year-old woman in Frisco October 8, 2016: Death of Norma French, 85, at The Tradition October 29, 2016: Death of Doris Gleason, 92, at The Tradition October 31, 2017: Death of Minnie Campbell, 83, at Preston Place December 31, 2017: Death of Carolyn MacPhee, 81, January 17, 2018: Death of Rosemary Curtis, 76, January 31, 2018: Death of Mary Brooks March 2018: Attempted murder of a 91-year-old woman in Plano March 4, 2018: Death of Martha Williams, 80, at Preston Place March 9, 2018: Death of Miriam Nelson, 81, at Preston Place March 18, 2018: Death of Ann Conklin, 82, at Preston Place March 20, 2018: Allegedly smothered first identified victim Lu Thi Harris, 81, on March 20, 2018, and is arrested He is charged with her murder May 2019: Charged with 11 other murders February 2020 Indicted with the murders of Leah Corken and Juanita Prudy, now facing 14 charges of capital murder in total Advertisement

After her face was covered with a pillow, she lost consciousness, but was later revived by Plano Fire and Rescue, where she revealed her attacker had stolen jewelry from her.

He is believed to have sold or pawned their jewelry after robbing his victims.

Many of the deaths now attributed to Chemirmir were first listed as deaths by natural causes as no foul play was suspected.

However, once he was identified as a suspect in Harris' death in March 2018, detectives began reviewing hundreds of natural death cases to attempt to identify other potential victims.

Chemirmir has been indicted in the deaths of 83-year-old Leah Corken; 82-year-old Juanita Purdy; 88-year-old Mary Brooks; 84-year-old Minnie Campbell; 82-year-old Ann Conklin; 75-year-old Rosemary Curtis; 85-year-old Norma French; 92-year-old Doris Gleason; 81-year-old Lu Thi Harris; 81-year-old Carolyn MacPhee; 81-year-old Miriam Nelson; 91-year-old Phyllis Payne; 94-year-old Phoebe Perry; and 80-year-old Martha Williams.

He is suspected of, but not yet indicted in, the deaths of 82-year-old Joyce Abramowitz, 87-year-old Glenna Day, 89-year-old Solomon Spring, 90-year-old Doris Wasserman and 86-year-old Margaret White.

He is still being investigated for nearly 1,000 unsolved deaths or attacks, and the victims are mostly elderly women who were in nursing homes.

In July 2019, the families of Purdy and Corken filed a lawsuit against The Tradition-Prestonwood in Dallas where it is believed three victims died within a three-month period in 2016.

The suit claims the living facility failed in security and repeatedly allowed a serial killer onto the premises.

Earlier this month, the families of two other potential victims, Ann Conklin and Miriam Nelson, filed a lawsuit against Preston Place Retirement Community, a separate living facility where Chemirmir is alleged to have found his victims.

Family members claim the 'necessary steps' weren't taken to ensure the safety of their loved ones.

Nelson's daughter Karen Harris claims that her mother reported that Chemirmir was trespassing on the property before her death and that she later learned reports had been filed by other residents.