A co-worker of a B.C. man who police believe may have killed himself and his family after an apparent confession on Facebook described him as a funny guy who was depressed by his daughter's health problems.

Police have still not confirmed that Randy Janzen killed his wife, sister and 19-year-old daughter, Emily, but say they are aware of a post on a Facebook page with Janzen's name on it that says his daughter was shot to end her suffering.

The CBC cannot confirm whether Janzen actually wrote the message.

The post says Janzen's wife was shot so she wouldn't have to live with her daughter's death or the shame of what he had done.

The Facebook book page belonging to a man named Randy Janzen is central to a B.C. homicide investigation. (Randy Janzen/Facebook)

Police say they are investigating multiple homicides linked to a house fire in a quiet British Columbia neighbourhood as well as a Facebook post in which a man appears to confess to the crime.

Investigators say they cannot confirm how many victims might be in the charred house near Chilliwack, east of Vancouver, or at a second crime scene in Langley, where at least one person was found dead.

The house sits on a quiet suburban street of large family homes and beautiful lawns with mountains in the distance. All that remained Friday of the house was a scorched shell with the roof mostly collapsed.

Neighbours said there was a police standoff at the home Thursday night that ended with the home on fire.

Co-worker says Janzen was 'a funny guy'

Raymond Norfolk, who identified himself as a co-worker of Randy Janzen at a sawmill, solemnly laid a bouquet of flowers by a tree near the house.

He said although he had never met Emily Janzen, he felt like he had grown to know her over the eight years he worked alongside her father because he talked about her constantly.

A B.C. house on Llanberis Way, owned by an R. and L. Janzen in Popkum. (CBC)

"It's brutal. I can't believe it. Randy was a good buddy, and now he's gone," he said after police held a news conference and confirmed the Facebook post was part of the investigation.

"I left work today. Honestly, when I heard about it I started crying. I had to go home and see my little girls, because it was too much."

Norfolk said the man described his daughter as a "lucky, go-getting girl — all up until the migraines."

He said her pain began as a child but grew so much worse in recent years that she began getting morphine shots.

His daughter's health problems took a toll on the man, Norfolk said.

"He was a funny guy, but he was a roller-coaster too. He was depressed, and then one minute he was up. And then he was down.

"She was the world [to Randy Janzen]," he said, before adding he'd heard his co-worker make some unusual statements.

"He kind of talked about it. If she ever goes, he's done. 'Why bother being here? There's nothing left in my life."'

Apparent confession posted to Facebook

The Facebook post from the man identified as Randy Janzen contains an apparent confession to the murders.

Whenever I start to feel sorry for myself, I just thank God I'm still alive. I complain about all the pain, but at least I'm here to feel it. - Emily Janzen

It begins by saying: "Over the last 10 days I have done some of the worst things I could have ever imagined a person doing."

The post goes on to detail how his daughter, Emily, had suffered since elementary school from migraines that made her "very ill" and had pushed her into a severe depression.

Randy Janzen poses with his daughter, Emily, in this Facebook post. (Randy Janzen/Facebook)

"I took a gun and shot her in the head and now she is migraine-free and floating in the clouds on a sunny afternoon, her long beautiful brown hair flowing in the breeze, a true angel," the post says.

"Now my family is pain free and in heaven," it concludes. "I have great remorse for my actions and feel like the dirt that I am."The post says the man shot his wife "because a mother should never have to hear the news her baby has died" and, "a couple of days later," killed his sister "because I did not want her to have to live with this shame I have caused all alone."

The post is signed "Love Daddio."

Whenever I start to feel sorry for myself, I just thank God I'm still alive. I complain about all the pain, but at least I'm here to feel it —@emmers_janzen

In April 2014, a Facebook post under Emily Janzen's name said she had just been accepted into the University of British Columbia's opera performance program. Late last month, she tweeted how thankful she was to be alive.

Last October, she posted a photo of herself on Facebook.

"Emily you are awesome," her father commented.

"Love ya daddio," she responded.