ARDMORE, OK - Crews have searched Lake Scott King in Ardmore for more than 4 days looking for a man who disappeared while he was fishing but said they have exhausted almost all conventional search methods.
Police said they have been searching for 83-year-old Billy Sharp since Thursday morning when witnesses found his boat overturned on Lake Scott King.
Ardmore Police Captain Eric Hamblin said, "We have used side sonar, we have used dragging, we have used cadaver dogs, we have put divers in the water."
Salvation Army Lodge Director Daniel Rusk said, "I've noticed that the air search they are doing, they are concentrating less on the lake and maybe a little bit more on the wooded area."
Investigators describe Sharp as an avid fisherman who was last seen Thursday morning fishing on Lake Scott King in Ardmore.
Witnesses said a short time later his boat was overturned and he was no where in sight.
"Anything we say at this point is going to be speculation," Captain Hamblin said. "We located the boat capsized, so we theorized that he somehow lost his balance and his boat capsized. and that probably lead to the drowning."
Authorities continue to do everything possible to find Sharp who has been missing for five days.
Investigators said Sharp's cause of death will more than likely be drowning but search teams say they have been working around the clock and don't plan on giving up until Sharp is found.
"Some of them can last, as far as we are concerned some of them can last for an hour or some can last for days," Rusk said.
"Until we find him and he is deceased, at this time he is still missing," Captain Hamblin said. "We presume him to be drown but at this time he is still a missing person so we will continue until we locate him."
Investigators are working through the night hoping for any sign of Sharp.
Police say Lake Scott King will remained closed to the public until he is found.