Pamela Humphrey said: "The only way to stop this happening again is for people to come forward and provide information that will see the killer and accomplices brought to trial as soon as possible.
“These people claim to have no fear but they do have one overriding fear, and that is of being caught. Let's reflect that fear by passing information that will see them being caught.
"I miss my son very much. Our family miss him very much; he was loved and is still loved."
Police to return to murder scene
Metropolitan Police say a man got out of a dark coloured vehicle, and after the shooting, the vehicle travelled south along Church Street towards Harlesden Town Centre.
Officers believe that shots were fired from an automatic weapon, although a firearm has not been recovered.
The murder investigation continues to be led by Detective Chief Inspector Mark Lawson of the Homicide and Major Crime Command.
DCI Lawson said: "This evening (Wednesday March 16), my detectives will return to the scene along with local officers to speak to people and encourage more witnesses, and anyone with information, to talk to us.
"Today, I am specifically appealing for the driver of a white transit van that was parked in Church Road, close to where the shooting took place, to come forward. I believe the driver was sat in the driver's seat at the time and it is possible they could have witnessed something.
"I would again like to reassure anyone worried about coming forward that they will be treated with the utmost sensitivity."
Pamela Humphrey's statement in full
The crime scene on Thursday (March 10) morning, where Oliver Tetlow was shot and killed
"On the evening of Wednesday, 9 March, my son Oliver Tetlow was shot and killed.
"It wasn't a killing, it was an execution.
"This country holds itself up as model of democracy with fair and open trials before judgement is passed. It is transparent so people can see justice being done, and done fairly.
"An execution of this sort doesn't fit it with the model of this country, and as such it was illegal at any level.
"My son was an innocent bystander and was 'accidentally shot'. It is a heartbreaking tragedy that any mother or parent will understand. I hope that everyone reading my plea will consider this: Next time it could be a member of your family, or even a close friend.
"The only way to stop this happening again is for people to come forward and provide information that will see the killer and accomplices brought to trial as soon as possible.
"These people claim to have no fear but that do have one overriding fear and that is of being caught. Let's reflect that fear by passing on information that will see them being caught.
Emergency services at the scene of the tragic shooting in Harlesden
"Providing information in this case isn't a matter of honour, these people do not respect the honour or safety of people, not of their kind. They believe they are a law unto themselves.
"Please, please help me and yourselves to bring the killer of my son and the accomplices of the killer to the full justice of this country.
"My son's death will not then have been in vain, you may save some innocent person, or the life of one of your family or close friends.
"I miss my son very much. Our family miss him very much; he was loved and is still loved.
"I hope you're never put into the awful situation that we find ourselves in right now.
"Please, please help me, help my family and in term help provide safety for yourselves and your families in helping us."
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