Edmonton Police used a Taser three times on a man who was resisting arrest late Thursday night, according to a woman who says she witnessed the incident.

Debbie Paradis watched as police tried to break up a fight between a 39-year-old man and a woman just after 11 p.m. near 106A Avenue and 96th Street.

“The one cop come out. Tried to talk to the guy and told him to put his hands on his head,” Paradis told CBC News on Friday.

“The other cop got out and he tried to put the handcuffs on him and he resisted.”

Paradis said the man was fighting the officers.

“They had him up against the car. Wriggled away from them. They grabbed him again. This is when they started to Taser him.”

The man was screaming in pain, Paradis said. She said the man stayed down on the ground only after police used the stun gun a third time.

“Two or three other cop cars showed up and then they started massaging him and I guess he went into cardiac arrest.”

Sources told CBC News that the man's heart stopped. He was rushed to hospital where he remains in serious condition.

The man had recently been released from jail and was causing problems in Edmonton's inner city, those sources told CBC.

The matter is now under investigation by the Alberta Serious Incident Response Team, which looks into incidents or complaints involving serious injury or death that may have resulted from the actions of a police officer.

ASIRT refuses to release any additional information on the incident.

With files from the CBC's Janice Johnston