They have been demanding a thorough investigation and arrest of anyone responsible for the death of Nazir Masih.
According to the British Pakistani Christian Association (BPCA), Nazir was a devout Christian and father of five. He was hit by four bullets whilst cleaning outside a local council building in Sialkot.
His brother said: "I had to tell his wife and children and the rest of my family.
"It tore my heart to shreds. I loved my brother Nazir so much.
"After letting the family know, I rushed to the place where my brother had been shot and found his dead body surrounded by many people in the street.
"There was blood all around him.
"He was such a humble gentle man and had no enemies.
"I cannot understand why anyone would want to shoot him."
Investigating police officer Mohammed Masood told the BPCA: "We are saddened by this murder case and have registered a First Investigation Report (FIR) 24/16.
"An investigation is under process and will be extremely vigorous.
"So far the motive of the killer is unknown, this may even have been a small scale terrorist attack.
"The Police authority is committed to find the killer and we hope to have success, as it happened in broad daylight."
The BPCA has launched an appeal for financial support for Nazir's family.
Chairman of the BPCA, Wilson Chowdhry, said: "This crime is not one of our usual persecution stories.
"Nevertheless, through no fault of their own a Christian family now find themselves in serious financial problems due to the loss of a main breadwinner.
"This family have little hope of justice and stand no chance of any compensation.
"We believe it is our Christian duty to help these victims and we will do whatever we can to help them adjust to their new deplorable situation."