"For anyone else it's bullets. For them it's a knife cutting the neck the way you would kill an animal. This is how they send a message that they were responsible," said Hamid Shakeel, the Quetta police chief of the method by which Khalil Rasjed Dale was killed, indicating the involvement of the Pakistan Taliban, the Telegraph
His remains were left on a road outside the city, tied by the ankles and wrapped tightly in cellophane inside a plastic bag, the Guardian
A note claiming to be from militant group Tehreek-e-Taliban Pakistan was found with the body, senior local police official Tariq Manzoor told AFP
The group said in the note that "our demands were not met (and) we have stuffed his (Dale's) body in a bag after slaughtering him. We will soon release a video of his beheading," according to Manzoor.
According to the Telegraph UK, his captors demanded $30 million (£18.4 million) from the International Committee of the Red Cross (ICRC).
Dale, a British Muslim who had been managing a health programme in Quetta for almost a year, was abducted in the city on January 5 by eight masked gunmen, who forced him from his car at gunpoint as he returned home from work.
Prime Minister David Cameron paid tribute to the kidnapped British Red Cross worker found dead in Pakistan, calling his murder a "shocking and merciless act".
Cameron said he "was deeply saddened" to hear about the death of Khalil Dale, and accused the attackers of having "no respect for human life and the rule of law."
"This was a shocking and merciless act," added the leader.
"Khalil Dale has dedicated many years of his life to helping some of the most vulnerable people in the world and my thoughts today are with his friends and family," he said in a statement.
Shiela Howatt, who worked with Mr Dale when he was a staff nurse at Dumfries Infirmary in the 1990s, said he was "no stranger to danger", and had previously been captured in Mogadishu.
"He was an absolutely lovely person devoted to caring for others less fortunate than himself," she told the BBC
"He spent his time in war-torn countries where help was needed, where people were desperate and that was Ken's role in life."