Cherchez la femme according to the Telegraph today:
The 52-year-old taxi driver had become fixated with a woman he knew only as “Hon”, who he had met on holiday in Thailand.
The pair met in 2007 and she had agreed to move to Britain to live with him.
It is understood that Bird – who was in serious financial difficulty – had sent her thousands of pounds, only to be rejected.
Last month, Hon, 32, sent him a text message saying she had met someone else and wanted no further contact with him.
A friend of Bird’s said: “She had no interest in him whatsoever, he felt like such a mug.
“Derrick said he had been made a fool out of, he couldn’t believe it.
“He couldn’t believe he had been so stupid. He went downhill from there but no one in the world would ever suspected what he would go and do.”
Terry Kennedy, a taxi driver and friend of Bird’s, was one of a group who had travelled to Thailand with Bird when the killer met Hon.
Mr Kennedy was shot in the hand last Wednesday by Bird and is still in hospital recovering.
He said the group had to gone to bars such as the Spicy Girls A Go Go venue and the Kennel Bar.
“Hon looked about 19 but I think she was about 30 at the time,” he said.
“I knew Derrick liked the lass so I told him to go for it, he had nothing to lose.”
Mr Kennedy, who is having specialist surgery on his hand, added: “To think I classed Derrick as a mate and then he goes and does this to me and all those other people is beyond words.”