A deranged Canadian man said in a Facebook post he fatally shot his 19-year-old daughter, his wife and sister Friday.

Randy Janzen included bizarre justifications for his murder spree. The teen, he said, suffered from headaches “and now she is migraine free.’’ His wife, he said, had to die because “a mother should never have to hear the news her baby has died.’’ He killed his sister, he said, to spare her the shame of what he did.

Cops found the body of one victim in a home in a Vancouver suburb and were looking for the others. After the murder spree, he set his own house on fire and authorities fear his body and the others will be found in the wreckage.

With Post Wires