A chiropractor from Oakville is dead, while a Burlington man remains in critical condition after a double shooting at a clinic on Plains Road East in Aldershot Thursday afternoon.

This morning, Halton police confirmed that Dr. Ferdinand “Fred” Mejilla (pronounced “Ma-Hail-Ya”), 50, of Oakville died in hospital from gunshot wounds.

He was the owner and operator of the clinic and father to five children.

Meanwhile an alleged suspect, David Williamson, 44, of Burlington, remains in critical condition in hospital with what police described as "a self-inflicted gunshot wound."

Williamson was once a patient of Mejilla's police say.

Jessica Koch, office manager at New View Window and Door, two storefronts down from the clinic, said she heard a commotion outside the store Thursday afternoon and saw a woman having a breakdown.

“All I heard was ‘my husband’ and ‘shot. Call 911’,” Koch said. “She collapsed and was crying and screaming.”

A man, who did not want to be identified, told the Burlington Post he had an afternoon appointment with Mejilla yesterday. It was his first appointment with him and he arrived only to find the clinic and parts of the plaza closed off to the public and a heavy police presence.

By 2 p.m., all but one shop, a dry cleaner, had closed for the day. The owner of the dry cleaner — four stores down from the clinic — did not want to be identified, but said he was inside his shop during the time of the incident and did not hear any shots fired. He went outside after noticing several police cruisers were entering the plaza.

Halton tactical officers cleared a blue Audi S5 sedan that was parked out front the clinic, then removed it's licence plates and had it towed away.