Published: Aug 17, 2010 4:07 PM EDT
Updated: Aug 17, 2010 1:07 PM EDT

MIRAMAR, Fla. (AP) - Investigators believe a man and woman found dead in the garage of a South Florida home might have been exposed to carbon monoxide.

Miramar police say 47-year-old Grantly Earl Calvin and 37-year-old Ivorie Jacques were found dead Saturday afternoon. Both were pronounced dead at the scene.

It's not clear how the two knew each other or why they were in a closed garage.

Carbon monoxide is a colorless, odorless and highly poisonous gas.