Phoenix police didn't immediately say Thursday how the two people were killed.
Their names and ages haven't been released yet.
Dozens of police units were in the area of 15th Avenue and Hadley Street about 1:00 p.m. following reports of the shooting.
Police say the homeowner returned to the residence and found two people dead in the backyard.
They say one of the victims is known to the homeowner and has been allowed to stay on property while helping to renovate the home.
Investigators are now looking for a truck that belonged to one of the men. It's described as a turquoise Dodge Ram with Arizona license plate BMJ5181.
If you have any information about this case, call the Phoenix police at (602) 262-6151.
Copyright 2015 The Associated Press modified.