Thomas Hickman drove through New Mexico, police say, until his Jeep Grand Cherokee Laredo ran out of gas. Then the 55-year-old North Richland Hills man walked into a field, tied helium balloons to a gun, covered his mouth with duct tape, and shot himself in the back of the head, according to New Mexico State Police. That determination is a far leap from what authorities first suspected when Mr. Hickman's body was discovered March 15 near Santa Rosa, N.M., about 100... (GunPolicy.org)