A Texas Home Care nurse arrested on suspicion of robbing and killing an elderly patient under his care, could also be responsible for multiple suspicious deaths that took place under his watch. According to Fox News reports, police will review death's dating back to 2010, that total around 750.

45-year-old Billy Kipkorir Chemirmir, a home care nurse, was arrested on Tuesday after one of the patients he was providing care to (81-year-old Lu Thi Harris) was found murdered in her Dallas home. According to police, Harris was allegedly smothered to death with a pillow by Chemirmir.

The pillow used in the homicide was found lying beside Harris, with her makeup smeared all over it. Chemirmir was also found to be in the US illegally, and authorities suspect he could be linked to many more deaths.

Family suspected him of theft

Plano Police Chief Gregory Rushin described the incident as disturbing, and a 24-hour line has since been launched aimed at receiving tips from members of the public. Initially, Chemirmir came to the authorities' attention after another family suspected the home caregiver of stealing from a relative who was under his care.

Acting on the suspicions, police tailed Chemirmir and saw him disposing of a jewelry box. When he was searched, jewelry, cash and a set of keys belonging to the patient who he was providing care to were found on him.

Also, a piece of paper found on the nurse was traced to the home of Harris.

Chemirmir is currently being held in Dallas County jail awaiting a capital murder charge in relation to Harris, while investigations into his possible involvement in past murders continue.

Victims coming forward

According to police, two other potential victims have since come forward, with stories of how the home care nurse tried to kill them by sitting on their chest and attempting to smother them with a pillow.

In 2016, Chemirmir, who is of Kenyan origin, was issued with a trespass notice after he was caught posing as an employee of a Dallas retirement community.

In Frisco, in October 2017, he was suspected of attacking a 93-year-old resident in an assisted living facility, making away with her jewelry after attempting to smother her with a pillow.

During the incident, according to a police affidavit, Chemirmir knocked on the victim's door posing as a repairman and asked if anything needed fixing. After the elderly resident said there was nothing broken, the nurse forced his way in, knocking her to the ground.

Chemirmir then proceeded to place a pillow on the victim's nose and mouth which prevented her from raising the alarm -- he also stole her jewelry.

He is being held on a $1 million bond.