Something didn’t look right. David Henneberry had been cooped up for hours, stuck inside as police searched for a suspect in the Boston Marathon bombings. He ventured out for some fresh air after police lifted their order to stay indoors.

He looked at the boat parked in his yard.

What he saw brought an end to the authorities’ sweeping manhunt. It would lead them to a fugitive, who was hiding on the floor of his boat.

“The tarp on his winterized boat had sort of been flapping in the wind,” his stepson Robert Duffy told CNN’s Piers Morgan.

Henneberry had tied down the covering on the vessel in his backyard so firmly that it had not budged all winter long, not even through this year’s blizzards.

“He got closer and realized that one of the retention straps had literally been cut — not chafed, not broken or unhooked,” Duffy said. Henneberry saw something else — something on the tarp that looked like blood. Read full story in CNN.