Halton police say the suspect in a double shooting at a Burlington, Ont., chiropractic clinic on Thursday has died. 

The suspect, Burlington resident David Williamson, 44, has died in hospital after what was believed to be a self-inflicted gunshot wound, said a police release.

Dr. Ferdinand (Fred) Mejilla, 50, died in hospital Thursday from gunshot wounds, police said. He was the owner and operator of the Mejilla Chiropractic Clinic located at 195 Plains Rd. E.

Williamson is believed to be a one-time patient of Mejilla.

A website for the clinic shows Mejilla held picnics and Christmas parties for his patients. The website also lists two staff members, Lisa and Shawna.

The shooting caused havoc at the quiet plaza, which includes a spa and a family-owned window and door store.

Ferdinand Mejilla

Dr. Ferdinand (Fred) Mejilla was shot to death Thursday at his Burlington, Ont., chiropractic clinic. (Halton Regional Police Service)

Jessica Koch, co-owner of Niew View Window and Door, said she heard a woman outside screaming, "He's has been shot. He's been shot."

She saw a woman sitting on the window ledge and called 911.

Mejilla leaves behind five children. Police said his family requests that their privacy be respected during this difficult time.

Police ask anyone with information to contact Crime Stoppers.