The only suspect in a double shooting at a Burlington chiropractic clinic has died in hospital.

David Williamson, 44, died of a self-inflicted gunshot wound, Halton police say. 

The shooting broke out inside Mejilla Chiropractic Clinic, located in a plaza on Plains Road East, sometime after noon on Thursday. 

Police believe that Williamson shot owner, Dr. Ferdinand "Fred" Mejilla before shooting himself. 

Mejilla was rushed to hospital with gunshot wounds.

The 50-year-old died of his injuries a short time later.

Williamson was a one-time patient of Dr. Mejilla, investigators say. 

A woman who said she frequents the clinic, Lisa Jane Emery, told CTV News Toronto that Williamson was married to the clinic’s receptionist. 

Mejilla left behind a girlfriend and five children between the ages of 19 and 11. 

Emery, who was a patient of Mejilla for one year and worked for him for two years described him as "a generous man" who went out of his way to "[understand] people's situations."

"He would charge people by their case and what they could afford," she said. "If they couldn't afford it, he would work with them in other ways."

A GoFundMe campaign was launched on Sunday by another chiropractor, Dr. Paul Groulx, who hopes to raise $50,000 for Mejilla's family. 

The homicide unit continues to investigate the shooting.

Police haven't released a motive.