Well Ms Wright was apparently in a fairly new relationship with Mr Robichaud, so although there does not seem to be a connection between any of them at this time, wondering...
The men are similar in age.
Maybe just seeing a new, presumably happy and affectionate couple, enraged the alleged killer?
The shooter was a bike rider, the victim, rode a motorcycle= too noisy?
speculation, imo.
New Brunswick shootings: Slain couple had just started their romance - CityNews Toronto
"The new relationship had been announced with a little blue heart posted on Facebook, but just days later a gunman in an apartment window brought it to a sudden and violent end.
For close friends and relatives of Bobbie Lee Wright, 32, and Donald Adam Robichaud, 42, the shooting deaths came as a stunning blow, ending the lives of two quiet people preparing for an outdoor adventure together.
“They were going to go zip lining after work. They were packing up the car before work and that’s when they got shot,” said Melissa Robichaud, Donald’s wife, from whom he recently separated".
“He loved music. He loved his Harley-Davidson".