CBS News reports that authorities are examining hundreds of senior deaths after an elderly woman was smothered in Dallas last year. The 81-year-old woman had been smothered to death with a pillow last March and her jewelry had been stolen. Billy Chemirmir, 45, was arrested and charged with capital murder. There are now several other deaths in northern Texas that authorities believe were too similar to be coincidence.

At least 750 senior deaths dating back to 2010 are now being reinvestigated searching for similarities in the cases.

In October 2017, a 93-year-old woman told police a man came to her door and identified himself as a maintenance man. When she told him she didn’t need any work done, he forced his way inside and tried to suffocate her. Although she survived, the man made off with multiple pieces of jewelry.

When officers started investigating the suspect in this case, they found video of Chemirmir throwing away a jewelry box with a name on it. When they determined the box’s owner lived in Dallas, they found the victim dead from suffocation in her home.

A set of keys found in Chemirmir’s vehicle also belonged to the murder victim.

Another very similar case emerged from Plano where a 91-year-old woman survived an attempted suffocation after a man broke into her home.

Chemirmir has been charged with attempted capital murder in the Frisco attack, but no charges have been filed in the Plano case.

Chemirmir has not entered a plea in the murder case, and is being held on a $1 million bond.

*Photo credit Dallas County Jail