Not only just the state park, but there are places along the river that would be accessible too I would think. Community parks, etc. Then heading toward Boerne all kinds of lightly traveled roads... wish I didn't have to work tomorrow or I would go help search
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I too have been leaning towards the possible suicide scenario. Not sure how true it is about the location of the ping, if so, the state park is a couple of miles from that area. Surely they have checked that area, L.E.
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