The brother of gunman Raoul Moat appealed to police to be allowed to talk to him in the hours before he shot himself in Rothbury in Northumberland.
Moat went on the run in July 2010 after shooting and seriously injuring his former partner Sam Stobbart, murdering her boyfriend Chris Brown, and blinding PC David Rathband.
Angus Moat told the inquest into his brother's death that he telephoned the police because he thought he might be able to "talk Raoul down".
He told the court in Newcastle: "I was completely appalled by his actions. But I didn't want him to die."
The 41-year-old tax inspector said he had not spoken to his brother for at least seven years and described their family as "very fragmented".
"Raoul thought everybody in his own family would be against him and I wanted to show him that was not the case," he told the jury.
"I thought if I could speak to him it could change the way he was feeling and the way he would act."
Police officers assessing potential helpers, or third party intermediaries, had told him by phone that his presence could put the police negotiators at risk.
Mr Moat acknowledged the police had a better idea than he did of "all the emotional triggers" affecting his brother's behaviour.
Much of the evidence on the second day of the inquest focused on who should have been involved in the negotiations to try to prevent Moat from shooting himself or others.