WILTON, Ark.—Divers spent Monday exploring the murky depths of Wilton Landing, searching for the alleged murder weapon used in a Nashville, Ark., homicide.

Investigators received a tip the pistol might be in the water late last week and began the search about 8:30 a.m. Monday, said Arkansas State Police Special Agent Hays McWhirter.

The search was a difficult one.

Divers estimated the water was more than 20 feet deep in some places and described it as “black water” with zero visibility.

McWhirter said investigators believe the gun is the one use...

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