Three people died from apparent carbon monoxide poisoning at Saguaro Lake in Mesa on Jan. 18, a poison that kills hundreds annually.

Here's what we know about three people dying from what officials believe to be carbon monoxide poisoning on a boat at Saguaro Lake on Jan. 18.

Detectives with the Maricopa County Sheriff's Office returned to Saguaro Lake on Sunday where three people were possibly killed by carbon monoxide. Officials said two women and a man were found dead inside a houseboat at the marina after someone called 911 to report they hadn't heard from or seen the group in some time.

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Three people were found dead on a boat and are believed to have died from carbon monoxide poisoning at Saguaro Lake Saturday afternoon.