'Good Samaritan' attacked at Southgate Centre has died, according to Facebook post

A man who wasassaulted while trying to intervene in a robbery attemptat the Southgate Centre earlier this week has died, according to a Facebook post from his wife.

Sharon Armstrong said onFacebookon Friday afternoon that her husband, IainArmstrong,had died.

• Violent attack atSouthgateCentre leaves mall employee in critical condition

IainArmstrong sufferedsevere head trauma on Tuesday after steppinginwhen he saw a man try to stealfrom a vacant kiosk at the mall.It's unclear if a weapon was used in the attack.

"Tragically, due to catastrophic injury, Iain passed away today at about 3 p.m.," reads the Facebook post. "The entire family has felt covered in prayer throughout this ordeal, and sends their heartfelt thanks."

On Thursday, a Facebook post said the 61-year-old manwas ina coma and had aspinal cord injury.

Attack was 'brief but vicious'

Edmonton police on sceneearlier this week likened Armstrong to a "Good Samaritan" for intervening.

Theyhad words of caution, as well.

"Inthe age we have right now, where everyone has a cellphone, we encourage people instead of being Good Samaritansby intervening in things like this, to try to get whatever is happening on video,"Insp. Erik Johnson said. "Because it definitely helps the police investigation,"

He describedthe assault as brief but vicious.

Mallsecurity footage has captured a clear imageof the main suspect in the attack.

Police said earlier this week that two men havebeen arrested and interviewed.

The male suspectisstill at large and police are not releasing any further descriptions of the suspect, according to a news release sent late Friday.

Homicide detectives have now taken over the investigationand an autopsy is scheduled for Tuesday.

Anyone with information about this incident to contact theEPSat 780-423-4567 or #377 from a mobile phone.