All three were shot. Only Pipe, who remains in hospital in a stable condition, survived.
Pepper, who owns her own property management company, said she'd been friends with Campbell for many years.
"I meet Wendy as an employee, she came to work for me a number of years ago and in recent years has been out on her own."
Pepper has maintained a very close friendship with Campbell and her family.
She said dealing with conflict and aggressive tenants was part of the job sometimes but yesterday's shooting was anything but predictable.
Pepper said Campbell's daughter had only recently joined the company as a trainee property manager and was enjoying the role.
Natanya leaves behind four kids — a toddler, two high school students and one in their late teens.
The tragedy has been widely felt in Whangarei.
"it's going to leave a big gap in a lot of people's lives and it's certainly created a shock wave in the community. In Whangarei everybody knows everybody; the property managers are all in contact with each other on a semi regular basis so it's a huge shock to a lot of people."