Published: 00:01, 17 April 2014 |
Philip Poole, of St Martin's Hill, said Edgar Dart, 56, was shot in front of his family when he tried to remonstrate with three armed intruders.
The gang were threatening his 13-year-old son George and five relatives after bursting into the luxury home.
As Mr Dart lay dying on the floor, the killers tied the rest of the family up and ransacked the house before fleeing with cash and jewellery.
Mr Poole's own son - 29-year-old Pip - was also attacked and suffered machete wounds.
The 59-year-old, who owns a cycle shop in Dover, told the Daily Mail: "Edgar was a tough guy and as soon as the men burst into the house he remonstrated with them. One of the raiders then shot him in the chest.
"The gang then tied everyone up, including his mother Joy and George. I have been told they were forced to look on helplessly as Edgar lay on the floor bleeding to death in front of them.
"It took him around an hour to die and there was just nothing they could do for him.
"It took him around an hour to die and there was just nothing they could do for him..." - Philip Poole
"The gang simply ransacked the house taking money and jewellery and then left. We just cannot believe what has happened.
"It is so difficult being so many miles away when family members have been involved in something as horrific as this.
"The police report on the killing is very scant. Crime is on the increase on the island and they do not want such matters reported because they fear it will damage the tourist industry."
The house near the city of Freeport belongs to Joy, who is a 79-year-old widow.
Her other son Colin, 55, his wife Alison and their 15-year-old son Luke also witnessed the murder.
Mr Poole added: "I do know that Alison managed to finally free herself and raise the alarm but by then it was too late for Edgar, who had bled to death.
"The worst image we have from this tragedy is George bound and gagged watching his father die – and there was nothing he could do to help him."
A Foreign Office spokesman said: “We are aware of the death in the Bahamas and we are providing consular assistance.”
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