The first pictures of a man struck at the crossbow were revealed while he was fighting for his life.
Gerald Corrigan, 74, was attempting to repair a satellite dish in front of his home in a remote area of Holyhead, Wales, when he was hit.
He managed to sneak into his house at 12:34 and call an ambulance.
He suffered "terrible injuries that disrupted his life" and was taken by ambulance to Ysbyty Gwynedd Hospital in Bangor.
It was only after the doctors discovered the lock during the examination that he realized that someone had tried to kill him.
Mr. Corrigan's family said, "This is a horrible incident that happened to our family. We can not think of anyone who might have wanted to hurt our father and our dear partner.
"We are trying to deal with this shocking incident.
"If anyone has any information about what happened, no matter how small, please report it to the police." We would like to pay tribute to the ambulance service and the medical staff for the incredible work they have done.
"We are hopeful and ask for confidentiality in this difficult time."
Chief Inspector Brian Kearney, of North Wales Police, said they were looking for someone who may be in the area at that time.
The force has explicitly urged anyone involved in the fight against lightning, hunting, game or pest control to communicate information.
Detective Inspector Brian Kearney said, "This incident, whose motive remains totally unknown, has resulted in terrible injuries that have disrupted the life of our community.We are at the beginning of our investigation and we are working hard. establish the circumstances behind this incident.
"A number of investigations are ongoing involving IDC detectives, local police teams and crime scene investigations." North West Wales and Anglesey remain one of the regions the safest in the UK Such incidents are extremely rare and we are determined to know who did this. "
Officers are also hoping for dashed video footage or CCTV videos of the region.
"We appeal to everyone who has visited the area around South Stack Road between 6 pm yesterday and 4 am today for them to come forward.
"We are also eager to talk to anyone who can live in or around this area and who may have a private video surveillance system, or to anyone who may have traveled along South Stack Road and who may have a video in outlet.
"We are at the beginning of our investigation and are working hard to establish the circumstances behind this incident.
"A number of investigations are ongoing involving IDC detectives, local police teams and a crime scene investigation."
Anyone with information is asked to contact police officers at Llangefni CID at 101 or via live webchat mentioning reference number X052857, or by Crimestoppers anonymously at 0800 555 111.