Samantha Leek QC, for E7, told the inquiry: "He believed that Mr Rodney had picked up and was preparing to shoot a fully automatic weapon, and he fired at Mr Rodney until he believed that there was no longer a threat. He fully understands that Mr Rodney's family hold him responsible for Mr Rodney's death. He believed that he had no alternative but to fire."
Ms Alexander broke down as she read a witness statement to the court room, which is in the High Court Principal Registry of the Family Division, and her barrister had to take over.
She said: "I can only say that I'm still shocked that guns were found by police in the car that Azelle was travelling in when he was killed. I do not believe from what I have heard that police had good reason to shoot at him, let alone kill him. Since April 30, 2005 my life has been in turmoil."
The mother of three said Graham and Lovell had walked away unharmed that day, while her son, whose girlfriend was eight months pregnant, was killed.
An inquiry is being held in to Mr Rodney's death because of secret areas of evidence that would have to be withheld from a coroner. Ms Alexander said she is concerned the secrecy will mean that some evidence will be suppressed.