The Tim Bosma tragedy was centered around an online sale.
The practice of buying and selling online is something that has been completely integrated into our society.
But it's now under the microscope following last week's horrific events.
Both the buyer and the seller need to ensure their safety, and for those skeptical of using the Internet for selling your items there are other options.
"If somebody shows me something they want to sell, I'll be able to evaluate it, give them a price and they decide if they want to sell it or not," says Andrew Greenham, owner of Forest City Coins.
"People have that feeling of security where they aren't going to get harassed it's going to be a pretty simple transaction," says Greenham.
But when it comes to buying something bigger like a vehicle or a boat, London police say there are some precautions you should take.
"If you have somebody that comes to your house and wants to buy your vehicle ensure that you look at their license and record their name. They are required to have a license to operate a vehicle and that way you know who they are," says Cst. Ken Steeves.
Other recommendations: meeting in a public place, telling friends and family where you are going, emailing a photo or a copy of the license to somebody else and keeping your cell phone turned on.
Online classified sites such as Kijiji has tips on smart ways to buy and sell posted on their website.
If you have a bad feeling about a transaction or meeting, simply don't do it.
There will always be another chance to buy or sell the item.
